January 1976
Horticulture Series No. 22
Auburn University 
,
Agricultural Experiment Station
R. Dennis Rouse, Director Auburn, 
Alabama

RESEARCH RESULTS FOR ORNAMENTAL HORTICULTURISTS
Nursery Crops
Horticulture Series No. 22
Auburn University Agricultural Experiment Station
R. D. Rouse, Director January 1976 
Auburn, Alabama
CONTENTS Page
Effects of Growth Regulator Mixtures on the Rooting of Softwood Cuttings.1
Kenneth C. Sanderson
Comparison of Several Commercial Root-Inducing Compounds and Three Experi-
mental Chemicals on the Rooting of Woody Ornamental Cuttings. 
Kenneth C.
Sanderson. 
1
Comparison of Ethephon and Jiffy Grow as Rooting 
Inducing Agents for Woody
Ornamental Cuttings. Kenneth C. Sanderson 
2
Further Studies on PBA as a Branching Agent on Ornamentals. 
Kenneth C.
Sanderson and Willis C. Martin, Jr. 
6
Growth of Rhododendron cv. 'Evensong' in Sphagnum Peat 
Moss Amended with
Various Inorganic and Organic Materials. Kenneth C. 
Sanderson and Willis
C. Martin, Jr. 
7
Index to Horticulture Series No. 1 to 21.
10

Effects of Growth Regulator Mixtures on the
Rooting of Softwood Cuttings
Kenneth C. Sanderson
Nature of Work: Previous studies indicated that Bayer 102612, a morphactin;
Nia 10637, a growth inhibitor; and ancymidol (A-Rest
TM
), a growth retardant
might influence the rooting of cuttings. The objective of this experiment was
to study the effects of these 3 growth regulators alone and in combination with
other growth regulators on rooting cuttings of 5 woody species. The mixtures and
concentrations used are shown in Table 1.
Softwood cuttings, 12.5 cm to 15 cm, of Cornus florida, lex latifolia,
Juniperus conferta, Mahonia bealei and Rhododendron hybrida cv. Kingfisher were
collected on June 28, 1972. Ten cuttings of each species were dipped per treatment
for 10 seconds prior to placing in a rooting medium of 1:1, v/v, horticultural
grade vermiculite and pasteurized builders sand. The cuttings were propagated under
mist (2.5 seconds out of every 100 seconds) with bottom heat of 700 F. A ferbam
drench, 1 tablespoon per gal., was applied to the cuttings 4 weeks after sticking.
On October 5, the cuttings were graded by species according to the following system:
0 = dead; 1 = alive; not rooted; 2 = callused; 3 = light rooting; 4 = medium root-
ing; and 5 = heavy rooting.
Results and Discussion: A mixture of 5 ppm Bayer plus 250 ppm ancymidol averaged
the best rooting score for the cuttings of the 5 species (Table 1). Cuttings treated
with 1,000 ppm Nia 10637 plus 500 ppm KGA and 1,000 ppm NAA gave the poorest average
score. Cornus florida cuttings rooted best when treated with 5 ppm Bayer plus 500
ppm KGA plus 1,000 ppm NAA. Generally, Ilex latfolia cuttings did not root well, how-
ever a mixture of 5 ppm Bayer, 125 ppm IBA and 1,000 ppm NAA yielded the highest
rooting score and 80% rooting. Juniperus conferta cuttings had the highest rooting
score when treated with 5 ppm Bayer plus 250 ppm ancymidol. Best rooting occurred
with Mahonia bealei when the cuttings were treated with 5 ppm Bayer, 250 ppm ancy-
midol plus 1,000 ppm NAA and 250 ppm ancymidol plus 125 ppm IBA and 1,000 ppm NAA.
Kingfisher azaleas had the best rooting score when the cuttings were dipped in mix-
tures of 1,000 ppm Nia 10637 plus 2,500 ppm B-Nine, 1,000 ppm Nia 10637 plus 500
ppm KGA and 250 ppm ancymidol plus 2,500 ppm B-Nine.
Publications: None
Comparison of Several Commercial Root-Inducing Compounds
and Three Experimental Chemicals on the Rooting
of Woody Ornamental Cuttings
Kenneth C. Sanderson
Nature of Work: Six commercial root inducing compounds and 4 experimental
chemicals (Table 2) were applied to the base of cuttings of 8 woody ornamental species
on October 11, 1973. Ten terminal cuttings, 12.5 cm to 15.0 cm, of the following
species were used in each treatment: Gardenia jasminoides, flex cornuta 'Burfordii',
flex cornuta 'Dwarf Burfordii', Juniperus conferta, Osmanthus ilicifolius, Pittosporum
tobira and Rhododendron hybrida. Rosa hybrida were treated similar to the other
species except single-eye cuttings were used. Liquid treatments were applied by
immersing the bottom 2.5 cm of the cuttings in the solution for 15 seconds.
2
Following treatment the cuttings were stuck in a medium of 1:1, v/v, sand and sphagnum
peat moss. Cuttings were misted during the day and bottom heat (700 F.) was used.
Rooting was scored on November 29, 1973 as follows: 0 = dead; 1 = alive, not rooted;
2 = callused; 3 = light rooting; 4 = medium rooting and 5 = heavy rooting.
Results: Generally, commercial root inducing substances yielded better results
than the experimental chemicals tested. Hormodin No. 2 treated cuttings averaged the
best rooting for all species (Table 2). Differential response to root inducing chemical
was observed. Gardenia jasminoides and Ilex cornuta 'Burfordii' cuttings rooted best
when treated with a mixture of 1,000 ppm Nia 10637 and 5,000 ppm NAA. Ilex cornuta
'Dwarf Burfordii' had the highest rooting scores when the cuttings were treated with
Hormodin No. 2, Jiffy-Grow No. 2 or Rootone No. 10. Cuttings of Juniperus conferta
rooted best following treatment with Jiffy Grow No. 2, 1,000 ppm Nia 10637 or 5,000
ppm SADH. Jiffy Grow No. 2 treatment gave the best rooting in Pittosporum tobira.
Osmanthus illicifolius and Rhododendron hybrida had the highest scores when cuttings
were treated with Hormodin No. 2. The best rooting of Rosa hybrida cuttings occurred
with 2,000 ppm CEPA.
A Comparison of Ethephon and Jiffy Grow as Root Inducing
Agents for Woody Ornamental Cuttings
Kenneth C. Sanderson
Nature of Work: Ethephon (CEPA or EthrelTM) has been reported to both stim-
ulate -and retard the rooting of cuttings. Little information is available on its
value as a root inducing agent for woody ornamentals. Preliminary research 
has in-
dicated that ethephon stimulated adventitious root production in certain ornamentals,
however recent tests showed that the value of ethe Mon as a root inducing substance
for woody ornamentals is questionable. Jiffy Grow , a combination of indole butryic
acid and napthalene acetic acid, has been found to be an excellent root inducing sub-
stance in previous Auburn tests. A factorial experiment was designed to compare ethephon
and Jiffy Grow
TM 
alone and in combination, as root inducing substances for cuttings
of Camellia sasanqua, Ilex cornuta 'Burfordii', Juniperus conferta, Pittosporum tobira
Rhododendrun cv.'Kingfisher'and Thuja occidentalis. Cuttings were propagated under
mist in a sand:peat medium on February 3, 1973. A glasshouse with a minimum night
temperature of 700 F. was used. The base of the cuttings were dipped for 
15-seconds
in the following treatments: none, 500 pm ethephon, 1,000 ppm ethephon, 1:1 Jiffy
GrowTM No. 2 and water, 1:4 Jiffy Grow and 500 ppm ethephon, 1:1 Jiffy GrowTM and
1,000 ppm ethephon, 1:4 Jiffy GrowTM and water, 1:1 Jiffy Grow and 500 ppm ethephon,
1:4 Jiffy Grow
TM 
and 1,000 ppm ethephon and 2,000 ppm ethephon. Rooting scores were
recorded on April 5, 1973 (Table 3).
Results and Discussion: A factorial analysis of the data revealed that ethephon
did not influence the rooting scores of the species tested. Cuttings 
treated with 1:1
Jiffy GrowT
M 
(3.6a) or 1:4 Jiffy GrowT
M 
(3.6a) yielded higher rooting scores than
untreated cuttings (3.2b). Species differed in rooting scores. In an analysis 
which
ignored the factorial design and included a 2,000 
ppm ethephon treatment, no differences
were observed in rooting scores for treatments 
of ethephon and Jiffy GrowT
M 
used alone
or in combination (Table 3).
Publications: Sanderson, K.C. 1975. An Evaluation of Ethephon as a Root Inducing
Substance for Woody Ornamentals. HortScience 10:315 (Abstract).
Table 1. Rooting scores of cuttings of 5 softwood species treated with various growo
Treatment 
Species.
Cornus Ilex Juniperus Mahonia Rooedo
florida latifolia conferta bealei c.Knfse
5 ppm Bayer....................................
5 ppm Bayer plus 1000 ppm NAA..................
5 ppm Bayer plus 125 ppm IBAplus. 1000 ppm NAA
5 ppm Bayer plus 1000 ppm Ethephon
5 ppm Bayer plus 250 ppm Ancymidol
5 ppm Bayer plus 1000 ppm Nia 10637.............
5 ppm Bayer plus 1:12 Jiffy Grow..
5 ppm Bayerplus 2500 ppm B-Nine..
5 ppm Bayer plus 500 ppm KGA..................
5 ppm Bayer plus 500 ppm KGA plus 1000 ppm NAA
1000 ppm Nia 10637..................
1000 ppm Nia 10637 plus 1000 ppm NAA...........0
1000 ppm Nia 10637 plus 125 ppm IBA plus- 1000
ppm NAA......................
10010 ppm Nia 10637 plus 1000 ppm Ethephon .
1000 ppm Nia 10637 plus 250 ppm A-Rest.......
1000 ppm Nia 10637 plus 1:12 Jiffy-Grow.....
1000 ppm Nia 10637 plus 2500 ppm B-Nine.....
100ppm Nia 10637 plus 500 ppm KGA.......
1000 ppm Nia 10637 plus 500 ppm KGA + 1000
ppm NAA...........................
3.5
4.4
3.9
3.4
3,4
4.1
3.6
2.1
2.6
4.8
4.0
3.5
3.4
4.3
4.5
3.3
299
3.0
3.6
250 ppm Ancymidol...............................3.8
250 ppm Ancymidol plus 1000 ppm NAA.........4.0
250 ppm Ancymidol plus 125 ppm IBA + 1000
ppm NAA.........................3.8
250 ppm Ancymidol plus 1000 ppm Ethephon..3.8
250 ppm Ancymidol plus 1000 ppm Nia 10637 . 4.4
250 ppm Ancymidol plus 1:12 Jiffy Grow.3.3
250 ppm Ancymidol plus 2500 ppm B-Nine. . .7
250 ppm Ancymidol plus 500 ppm KGA. . . . .3.2
1: 12 Ji ffy-Grow...........................3.7
1000 ppm NAA...............................4.2
2500 ppm B-Nine....................3.8
Mean .............................3.3
2.0
2.9
4.4
2.0
2.0
2.0
2.0
1.9
2.1
2.2
2.2
2.3
3.4
2.0
2.0
2.0
2.0
2,1
1.4
1.4-
2.4
3.2
3.4
2.2
2.4
2.8
1.6
1.8
2.2
2.0
1.9
2.0
2.8
2.9
2.6
1.1
1.0
2.0
2.2
2.7
1.6
2.5
2.0
2.7
2.0
2.7
2.8
2.5
2.2
2.1
2.0
2.6
2.4
2.0
2.0
2.1
1.8
1.5-
1.8
2.7
2.0
2.2
5.0
4.2
3.8
4.0
4.8
4.434.4
4.8
4.0
3.6
4.8
4.8
4.0
4.2
3.8
4.2
4.5
4.0
4.2
4.6
5.0
5.0
4.0
4.4
4.2
4.2
4.8
4.6
2.8
4.4
4.3
4.1
2.5
3.9
4.0
4.9
4,7
4,7
3.8
4.8
4.4
4o6
4.2
4.6
4.8
4.1
4.9
5.0
5.0
3,8
4.3
3.9
2.9
4.3
4.4
4.7
5.0
4.1
3.5
3.7
4.3
4.2
)ns
~an
3.2
3.0
3.6
3.3
3.7
3.4
3.4
3.0
3.0
3.3
3.5
3.3
3.4
3.4
3.4
3.4
3.4
3.0
2.9
3.3
3.5
3.3
3.1
3.5
3.2
3.4
3.1
3.2
3.2
3.4 wJ
Table 2. Rooting scores of six ornamentals treated with commercial root-inducing compound
z 
y
Treatment Spe cies
Gardenia Ilex Ilex Cor- Juniperus Pitto- Osmanth
jasmin- Cornuta nuta'Dwarf conferta sporum ilicifon
aides 'Burfordii' Burfordii' tobira
Check0. 1.9 3.5 2.3 2.7 2.0 2.5
Hormodin No. 2 TM ...... 4.0 3.5 4.3 1.8 2.6 3.8
Hormodin No. 3 TM 1.....1.8 3.6 3.9 1.67 42
Cutstart XX TM 2......2.5 3.2 3.8 3.1 2.1 3.9
Rootone...... .. 1.2 3,5 2.1 1.5 2.9 3.6
Rootone No. 10. . 2,0 3.2 4.3 2.6 2.1 2.3
Jiffy Grow.............0.9 3.9 4.3 3.6 3.4 3,72.18
1000 ppm Nia 10637........0.8 4.0 4.0 3.6 2.4 2.82.25
500 ppm GEPA...........4.2 3.5 3.4 3.0 3.2 1.92.22
1000 ppm CEPA..........4.3 3.6 2.9 3.3 2.0 3.41.24
2000 ppm CEPA..............3.1 3.7 2.9 3.1 2.9 2.72.32
1000 ppm Nia 10637 plus
5000 ppm NAA.................4.8 4.2 4.0 2.0 2.6 2.51.15
5000 ppm SADH...............3.2 3.7 3.2 3.6 2.3 2.62.16
Me an................2.6 3.6 3.4 2.7 2.4 3.02.20
nicals
Mean
2.4
3.1
2.5
2.7
2.3
2.6
3.0
2.7
2.9
2.9
2.9
2.9
2.7
z Hormodin No. 2 and No. 3 are various strengths
Rootone and Rootone No. 10 are various strengths
of indole butyric acid manufactured by Merck and Co.,, Rahway,. N. J.
of a combination of 3-indole butyric acid, l-naphthalene acetimide
and 2-methyl naphthal-ene acetimide manufactured by Amchem Products Ambler, Pa. Cutstart X sauietfe
substance manufactured by Vitamin Institute, North Hollywood, CA.
Jiffy Grow No. 2 is a combination of 2-napthalene acetic acid, 3-indole butyric acid, a funiieadbrnmn
by G and W Products, Estacada,- OR. Nia 10637 is Magra Chemical Company's, Middleport, N.Y.eprmna 
hmc
ethyl hydrogen 1-propyiphosphonate CEPA or Ethrel TM is (2-chiorethyl) phosphonic acid manfcue b mhmP
Co., Ambler, PA.
SADH or B-Nine TM is succinamic acid 2,2-dimethyl hydrazide manufactured by Uniroyal, Bethay T
YScoring: 0= dead, 1= 
alive, 2 = callused, 
3 = light rooting, 4 = 
medium rooting, 5 =hayroig
noting
ifactured
r1c
2odct
Table 3. Comparison of rooting scores of six ornamental cuttings 
treated with 2,000
ppm etheph on and various combinations of ethephon 
and!Jiffy Grow
TreatmentZ
500 ppm ethephon . a.0.00.0.......
1,000 ethephon. . . . . . . .
1:1 Jiffy Grow No. 2 .. 0 0 .. 0
1:1 Jiffy Grow and 500 ppm ethephon
1:1 Jiffy Grow and 1,000 ppm ethephon
1:4 Jiffy Grow......................
1:4 Jiffy Grow 500 ppm ethephon . 0.
1:4 Jiffy Grow 1,000 ppm ethephon.0
2,000 ppm ethephon..........
ZEthephon (CEPA or Ethrel) is (2-chlorethyl)
Products, Ambler, PA.
a s " ."." ." ." ." ." .
" " " 0 " " " " " 0 "
3.2 a
3.2 a
3.1 a
3.5 a
3.6 a
3.8 a
3.4 a
3.6 a
3.9 a
3.5 a
phosphonic acid manufactured by Amchem
Jiffy Grow No. 2 is 
a combination of 2-napthalene 
acetic acid, 3-indole butyric
id, a fungicide and boron 
manufactured by G and W 
Products, Estacada, OR
Scoring: 0 dead, 1 alive, 2 callused, 3= 
light rooting,.4= medium r ooting,
5 = heavy rooting.
Means followed by the same 
letters are not significantly 
different at the 5%
level according to Duncan's multiple range 
test.
,Lt,,tY
" " "
" "
" " "
" " " " "
" " " " " " "
" " " " "
" " " " " "
0 . 0 0 0 0 0 0
6
Further Studies on PBA as a Branching Agent on Ornamentals
Kenneth C. Sanderson and Willis C. Martin, Jr.
Nature of Work: PBA (Shell Chemical Company's synthetic 
cytokinin called
Accel) has been found to influence branching in certain 
plants. Two experiments
were conducted to test PBA as a branching agent on azalea cv. 'Kingfisher', Bur-
fordii holly and garden chrysanthemums. Rooted cuttings of the woody ornamentals
were planted in 3-in. pots on May 21, treated on June 24, and pinched (sheared) on
July 3, 1974. Treatments were 0, 200, 400, 
800, 1,200 ppm PBA. Dupont's surfactant
B955 was added (4 ml per liter) to all sprays which 
were then applied to runoff.
Plants were grown in a lightly shaded greenhouse 
under normal cultural practices
for liners. Total number of shoots per plant were determined 
on October 17, 1974.
Branching is important in garden chrysanthemums for adequate flower yield
and display. Cultivar selection, pinching methods 
and culture influence the number
of branches per plant. If these methods fail, the grower's 
only recourse has been
to increase the number of plants per container, thus increasing production costs.
PBA was applied as a spray to three garden chrysanthemum cultivars ('Festive Cushion'
'Jackpot' and 'White Grandchild') at the rate of 0, 100, and 200 ppm in a randomized
block designed experiment. All sprays were applied until runoff 1 week (January 31)
prior to pinching (Feb. 6, 1973). Plants were grown in 4-in. pots (2 rooted cuttings
per pot on January 11), in a greenhouse using standard cultural 
procedures for garden
chrysanthemum production. Plants received supplementary light from 10 p.m. 
to 2 a.m.
each night from January 11 to February 13 and short day treatment with 
black cloth
from February 13 to flowering.
Results and Discussion: Sprays of PBA did not increase the number of shoots
per plant in 'Kingfisher' azaleas and 'Burfordii' holly (Table 4). At a concentration
of 1,200 ppm PBA reduced the number of shoots on 'Burfordii' holly. Garden chrysan-
mum plants sprayed with 200 ppm PBA produced more shoots per plant 
than untreated
plants. The number of shoots on plants sprayed with 100 ppm and 
200 ppm PBA did not
differ. Cultivars differed from each other in shoot number as follows: 'Festive
Cushion', 4.1; 'Stardom', 3.6; 'White Grandchild', 3.9; and 'Jackpot', 3.1. Our
results agree with other investigators who found PBA to be an 
effective agent for in-
creasing shoot number in chrysanthemums. Commercial use of PBA on chrysanthemums
will probably depend on economic factors.
Publications:
Sanderson, K. C. and W. C. Martin, Jr., 1974. Effect of DPX 1840, PBA and
Glyphosine on Shoot Growth in Garden Chrysanthemums. Proc. Fla. State Hort.
Soc.87:558-560.
Table 4. Total number of shoots per plant on Burfordii holly 'Kingisher'
azalea and garden chrysanthemum plants treated with PBA sprays
PBA spray 'Burfordii' 'Kingfisher' Garden
concentration (ppm) holly azalea chrysanthemum
0 ..... . . . ........ 3.6 abz 
9.7 a 3.6 b
100. .......... ....... 3.8 ab
200 . ......... ...... 3.4 ab 
9.5 a 4.0 a
400 . ......... ......... 
3.9 ab 10.0 a
800 . ... . . .............. 
.. 4.0 a 9.7 a
1200 . . ........... .. 
. 2.9 b 9.3 a
ZMean separation by Duncan's multiple range test at 5% levels. 
Means, in columns,
followed by the same letter(s)do not differ.
Growth of Rhododendron 
cv. 'Evensong' in Sphagnum 
Peat Moss
Amended with Various Inorganic 
and Organic Materials
Kenneth C. Sanderson and 
Willis C. Martin, Jr.
Nature of Work: Liners of 
the azalea cultivar 'Evensong' 
were sheared to 13
cm height prior to use in one 
experiment using inorganic 
amended media and a second
experiment using organic amended media. 
Various amounts of perlite, 
calcined clay
(Turface
TM )
, vermiculite and sand 
were added to imported 
sphagnum peat moss in the
first experiment (Table 5). 
Municipal compost (Mobile 
AidT
M
) and bagasse (Bet-R-
GrowthT
M
) were the organic amendments 
used in the second experiment 
(Table 3). All
media received 2 oz. of limestone 
and 2 oz. of gypsum per bu. 
Plants were fertili-
zed every month with 2 lb. 
of 21-7-7 water soluble fertilizer 
per 100 gallons of
water. Experiments were 
established outside under 
normal container plant culture 
on
April 1, 1971. Plant height 
and spread data were recorded 
on May 2, 1972.
Results and Discussion: Many 
shoots of plants grown in sand 
and sphagnum peat
moss media died. Total 
plant death in inorganic 
amended media was greatest 
in those
containing calcined clay 
amended with (13%) and 
least in vermiculite (9%). 
Plant
losses in media amended 
with sand and perlite were 
8% and 3%, respectively. 
Shoot
and plant death may have 
been due to deficiencies, winter 
injury, overwatering, or
a combination of causes. 
The greatest plant height 
and spread was produced 
by plants
grown in 8:3 sphagnum peat moss and perlite media 
(Table 5). Sphagnum peat moss media
yielded plants with greater 
height and spread than 
plants grown in peat 
moss amended
with various inorganic materials (Table 
6).
PlantS grown in all-organic amended 
media grew well. The tallest plants 
were pro-
duced in 9:1 sphagnum peat moss and 
Mobile Aid (Table 7). Plants grown 
in sphagnum
peat moss alone had 
the widest spread. Generally, 
plants grown in sphagnum 
peat moss
alone were equal or 
superior to plants 
grown in sphagnum peat 
moss amended with Mobile
Aid or Bagasse.
8
It is concluded that sphagnum peat moss alone is a better media than
sphagnum peat moss amended with various inorganic and organic amendments for the
growth of azaleas. Further investigations on minor element additions should be
considered since there are some indications that benefits of certain amendments
may be due to minor elements.
Table 5. Growth of Rhododendron cv. 'Evensong' in Media of Sphagnum
Peat Moss and Various Inorganic Amendments
Media (by volume) 
Height (cm) Spread (m)
Sphagnum peat moss ....... .................... 
... 36.0 39.3
1:1 peat moss and perlite ................. . . .
34.8 38.3
6:4 peat moss and perlite ..... ............... ... 33.5 41.6
7:3 peat moss and perlite ... ............... 30.6 34.0
8:2 peat moss and perlite ................ 42.9 46.7
9:1 peat moss and perlite ................ 34.1 33.8
1:1 peat moss and calcined clay (TurfaceTM) . . . . . 32.6 31.3
6:4 peat moss and calcined clay (TurfaceTM) ........ .. 
26.6 24.4
7:3 peat moss and calcined clay .... ............. ... 22.6 
22.3
8:2 peat moss and calcined clay .................. 
.... 30.3 32.8
9:1 peat moss and calcined clay .............. 
. . . 29.1 32.2
1:1 peat moss:vermiculite ....................... 
... 32.9 33.9
6:4 peat moss:vermiculite ....................... 
... 25.9 33.3
7:3 peat moss:vermiculite ....................... 
.... 34.0 36.7
8:2 peat moss:vermiculite ....................... 
30.3 36.4
9:1 peat moss:vermiculite ...... 
................ .. 35.1 36.2
1:1 peat moss and sand ......................... 
.... 24.1 29.1
6:4 peat moss and said ......................... 
... 24.1 29.1
6:4 peat moss and sand ........................ 
.... 30.0 31.6
7:3 peat moss and sanc . ...... ................ 
.. 24.5 28.9
8:2 peat moss and sand ....... .................. 
.. 26.8 32.8
9:1 peat moss and sand . ........................ 
.. 35.0 36.6
Mean . . .... ........................... 
.. 31.0 33.9
9
Table 6. Growth of Rhododendron cv. 'Evensong' in Sphagm
Peat Moss Amended with Various InorganLc Materials
Amendment Hfeight (cm) Spread'(cm)
Perlite35238............ 39
Calcined clay .. 28.2 28.6
Vermiculite 0 i * * * * * *.......... 31.6 35.3
Sand . . . . . 0 . ......... .0 . 28.1 31.8
None e e 0. &.41 0.0.I.... .... 36.0 39.3
Mean ' I .. . . .31.8 34.8
Table 7. Growth of Rhododendron cv. 'Evensong' in Media
of Sphagnum Peat Moss and Various Organic Amendments
Media (by volume) Height (cm) Spread (cm)
1:1 Sphagnum peat moss and Mobile ad * * * 48.0 
31.6
6:4 Sphagnum peat moss and Mobile aid 0* *0 * *54.0 32.9
7:3 Sphagnum peat taoss and Mobile &id 0 0 0 55.1 37.5
8:2 Sphagn'um peat moss and Mobile aid 0 0.0.52.7 37.
9:.*61 Sphagnum peat moss and Mobi le id..... 55.8 36.6
Sphagnum peat moss......................52.8 40.2
1:b1 Sphagnum peat moss And bagasse............ 42.5 31.0
6-,4 Sphagnum peat moss and hagasse e.&.o.&.*. 39.8 35.5
7:3 Sphagnum peat moss and bagasse ............38.7 34.0
8:2 Sphagnum peat moss and b~agasse ............42.3 38.e8
9:1 Sphagnum peat moss and bagasse 0.0.0 0.*. 33.8 34.3
*.. ... .. ... .. 46o9 35.4
Table 8,,*,Growth of Rhododendron cv *'Evensong' in Sphagnum Peat
Moss Amended with Various Organic Materials
Amendment Height (cm) Spread (cm)
Municipal Compost (Mobileaid TM.53.1
Bagasse . . . 39.4
N one .. . ---.. . .. . . . 52.8
Mean 0 0 0 0 0 0 6 9 6 0 8 * fl op . . . . . 48. 4
35.*2
34.7
40.*2
36.7
-u-- --
c r
10
Author and Subject Index
Series Numbers 1 to 21
Prepared by Jeffrey W. Butts and Kenneth 
C. Sanderson
Amling, H. J.
Annuals
Azalea
Chemical pinching
Cold hardiness
Cold storage
Fertilization
Giberellic acid
Growth retardants
Growth inhibitors
Irrigation
Light intensity
Marketing
Mist
Morphactins
Mulch
Packing
Photoperiod
Propagation
Rooting Substances
Temperature
Weed Control
Bagasse
Barrick, W. E.
Boron toxicity
Broadleaf evergreens
Bryce, H.M.
Camellia japonica
Carbon dioxide
Carnations
Chemical pinching
Christmas cherry
Christmas pepper
Chrysanthemums
Boron toxicity
Carbon dioxide
Chemical pinching
Cultivars, garden
Cultivars, pots
Fertilization
Foliar analysis
Growth retardants
Keeping quality
Media
Mulching
Nutrition
Container plants
Fertilization
Foliar analysis
8:1-8
10:7-8
10:2; 12:23,25,13:4,7 9-12; 14:14; 18:17; 21:5; 19:13,15,18
13:3
5:1
21:9
4:3; 5:3; 19:19
3:6; 5:1, 3; 6:1; 7:6; 8:5; 12:23,25;13:7,11; 18:17,23; 19:13,14
18:9; 19:13
4:1
1:10; 5:1
1:3
19:8
18:17; 19:11
17:5
1:3
5:1; 14:2; 13:13,14; 18:25; 19:1,8
3:6; 4:4; 8:5; 13:1,2; 18:3, 12; 19:10
8:5; 8:6; 13:2; 18:3; 18:12; 19:10
13:14; 14:2; 19:1
14:6; 17:5
9:5-7; 11:1-2
12:23,25; 14:7,9-12,14; 14:2-4; 18:17; 19:1,8,11,18
20:7-9,13-15
1:2
8:1-5,7,8; 10:1,2; 12:1
3:5
9:9
16:20-22
9:9-10;10:2-5;12:23-25; 13:4-7; 14:4-7; 14:4-5; 19:11-12, 18-19
20:10
20:10
20:13
9:9
9:9
1:5; 7:4; 8:8; 12:3; 12:5
9:10
20:21
16:1; 20:16
9:1
9:5,7,12; 16:1,7,8,9,11,12; 20:16
10:6; 17:2
16:1; 20:13
1:5-8
1:7-10; 2:1-3; 3:1-2; 4:2-3; 14:1-2
3:3
Foliar feeding
Garden chrysanthemums
Grading
Hardiness
Media
Production
Site preparation
Type of container
Weed control
Cornus florida
Culture
Chrysanthemum
Lyonia lucida
Poinsettia
Deciduous Ornamentals
Donovan, E. J.
Dormancy
Easter lilies
Emgard
Fertilization
Ilex crenata
Lyonia lucida
Magnolia grandiflora
Flowering
Camellia
Foliar analysis
Foliar feeding
Forsythia intermedia
Furuta, T.
Geranium
Gloxinia
Germination
Gibberellin treatment
Loblolly pine
Gogue, G. J.
Growth regulators
DPX
Gibberellin
IAA
IBA
IPA
Kinetin
MRH
NAA
PBA
24D
245T
Growth retardants
Ancymidol
CBBP
CEPA
Chlormequat
Chloroflurenol
EHPP
SADH
3:1-2
1:5
2:5
5:4; 6:2; 13:3-4
10:5-6; 14:1-2
5:4-6
1:5; 2:3-4
1:6
7:5; 21:11-12
18:5-9
9:12-13
3:3
11:5-6
1:1; 4:4
7:1, 4-6
4:4; 5:1
16:13-16; 20:4,5,6
9:9-10; 10:2-5; 12:23-25
1:7-10; 2:1-3; 3:1,2; 14:1-2; 20:21-22; 21:7-10
1:8
1:10
1:9
3:5
3:3; 20;16-20
3:1-2
12:1-3; 21:7,8
1:1-112; 2:1-5; 3:1,3-6; 4:1-4; 5:1,4,6; 6:1,2
16:16,17
16:17
1:4; 10:2
8:7
20:13,16
18:23,24; 19:14,15; 20:4-6; 21:4
1:4; 4:6; 5:3-4; 10:2; 19:19-20
13:1-3
13:1-3; 18:5-9,12-16; 19:15-17
13:1-3
19:19-20
30-21:4
18:3-9; 19:10-11,19-20
21:5
13:1-3; 18:34; 19:10-11
13:1-3; 18:12-16; 19:15-17
18:3-9,12-16,19-20,23-24; 19:10-17, 20:4-6, 21:1-4
20:4-6,10; 21:1-3
14:4-5; 18:3-4, 12-16, 19-20, 23-24; 19:1,18-24; 21:1-4
3:6; 4:3; 5:1-2; 6:1,7; 11:3-5,6-8,16-19; 19:14-15; 20:10
18:3-4, 17-20; 19:11-12,15-17,21:1-4
18:3-9; 23-24; 19:10-17; 20:4-6; 21:1-4
5:12, 6:1, 7:6, 9-12, 23-25; 9:1-5; 11:3-5, 6-8, 16-19
13:2,7-911,12; 18:12-16,19-20,23-24; 19:10-11; 21:1-3
11
12
SAPL
flerhi I, des,
I I I g 1)wF)Y P] 1 t1-4
Native plants
Survival
Weed control
Hogg, N. J.
flex crenata
Irrigation
Juniper
Keeping quality
Light intensity
Ilex
Azalea
Lilium longiflorum
Loblolly pine
Lyonia lucida
Magnolia grandiflora
Malus
Marketing
Nursery stock
Martin, W. C.
McQueen, H.F.
Media
Mi cronutrients
Miller, L. C.
Mist Propagation
Mi tecides
Moore, J. C.
Morris, K. M., Jr.
Mulching
Municipal compost.
Media
Mulch
Nell, T, A.
Off shoo t-0
Ornamental plants
Orr, Henry P.
Packing and shipping
Pate4-.-T
Propagation
azalea
3:1-2; 18:12-16,19-20,23-24; 
19:14-15
7:5; 8:2-3; 14:6-7; 17:3-11, 
21:4, 11-12
6:2-3; 7:1-4
10:1, 12-13
7:1-4; 8:1-2
8:3-4; 17:3-5
8:1-5,7,8; 10:1,12:1
1:8
4:1-2; 5:5; 6:2
18:26
9:7-8; 11:1-2
1:10
5L;3-4
20:1-3
8:7
1:10
.1:9
1:4
10:8; 12:5-21
7:5; 18:27-28
1:5,6,7,10; 2:1-5; 3:1,6; 4:1-4; 5L;,4,6; 7:1,4,4; 
7:1,4-6; 8:1-8;
9:1,5,7,9,10,12; 10:2,5-7; 11:1,3,5,6,9,11,12,13,16; 
12:3,5,22,
23,25; 13:2,7,9-12;15:1,3,4,5,7,11,17.20; 17:1; 20:1;4,10,11,21;
21:5,7,9,11
20:1
9:5-7,9,12-43; 11:1-2; 15:7-10; 16:1-24; 18:19-20,26; 20:7-9,
16-20
21:7
10:8; 12:5
1:4
20,:1-3
8:1-5,7,8
18:5
10:6-7; 14:6-7; 17:1-12
10:6-7
10:6,18,21,22; 20:7-9
10:6-7; 12:22-23; 16:1-24
18:3
10:2-5; 12:23-25; 12:4-13; 14:4-5; 19:18-19
1:8-10; 3:*3-4; 10:2-5; 12:22,23; 17:1-12; 18:27
1:4,8-10; 2:01-5; 3:03,6; 4:1-4; 7:*1,4-6; 8:1-5,78; 
10:1-2,
5-8; 12:1,3,5,11; 17:1; 18:27
1:1-3; 2:5; 
3:3-4
4:4; 8:5; 13:1-3; 18:3-4,12-16; 
19:10-11, 18-19
13
Camelia 1:4
Cornus florida '18:5-9
Fungicide-dip .13:2
Ilex 4:4; 18:12-16
Influence of leaves 5:7; 6:1
Juniper 18:12-16,26
Metaseguoia 4:4; 18:12-16
Nurse-seed grafting 5:7; 8:4-5
Poinsettia 11:11 -19
Pyracantha 4:4
Red cedar 
1:4
Rosa -Banksiae 2:5
Salt Sensitive species 20:7-9
Time of taking cutting 5:6
Root inducing compounds 5:6; 8:5-7; 11:11; 18:3-9,12-16; 19:10-11,15-17
Rosa Banksiae 2:6
Shrubs 2:5
Reiger. elatior begonias '20:11,12
Sanderson, K. C. :,46 8:1-597,8; 9:1,5,7,9,10,12; 
10:2,5,6; 11:1,3,5,6,9,
11,12,13,16; 12:22,23,25; 12*1-4,7,9-;14; 14:1,2,4,6; 15:1,3,
495j7911,17920; 16:1,7-9,11-13916p179189203123; 17:1; 18:3,
5910,12,17,19,21,-23,125p25; 19:1,8,10,11,13,14,15,18,19, 20:1,
4,7,10,11,,13,16,21; 21:194,5,17,9,11;
Self, Re..1:2; 
10:3,5; 13:3,4
Shoot-development 18:17-18; 
19:1-9,11-14
Shumack, Re Le 20:1
Silver spreading red
cedar
Snapdragons
.Cultivars
Culture
Fertilization
Lifelite cover
Media
Soil Moisture
Temperature
Turf
Variety trails
Annuals
Chrysanthemums
Poinsettia
Snapdragon
Rieger begonia
Woody ornamentals
1:4
15:201
15:17-19
15: 7-10; 16:18-20
3:** 4-5
13:13-14; 14:23; 18:1-7;
18:27-28
10: 7-8
1:5; 7:4; 8;8,9-10, 12:3-5;
11:9-10
15:1-6
20:11-12
1:6; 2:4-5; 8:1,2,3; 10:5-8;,12:05-21; 18:21,22