| Material Information
||Growth of Dieffenbachia 'Camille' and Schefflera arboricola with Gro-Prod as a potting ingredient
||CFREC-Apopka research report
||2 p. : ; 28 cm.
||Poole, R. T ( Richard Turk )
Conover, Charles Albert, 1934-
Central Florida Research and Education Center--Apopka
||University of Florida, IFAS, Central Florida Research and Education Center-Apopka
||Place of Publication:
||Foliage plants -- Growth -- Florida ( lcsh )
Dieffenbachia -- Growth -- Florida ( lcsh )
Potting soils ( lcsh )
||government publication (state, provincial, terriorial, dependent) ( marcgt )
non-fiction ( marcgt )
||Statement of Responsibility:
||R.T. Poole and C.A. Conover.
| Record Information
||University of Florida
||All rights reserved by the source institution and holding location.
||oclc - 70553221
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roiL Growth of Dieffenbachia 'Camille' and Schefflera arboricola
f 11 with Gro-Prod as a taipq IM redient'
R. T. Pole and C. A. Conover'
University of Florida, rFAS
Central Florida Research-and Education Center Apopka
CFREC-Apopka Research Report, RH-89-4
Peat moss is the primary ingredient used in potting mixes for growing
foliage plants. However, many other ingredients have been used to
successfully grow foliage plants in containers. A relatively new European
introduction with possibilities is Gro-Prod (Gro-Prod, Inc. Clifton, NJ), a
sterile and inert rockwool, produced as fine, medium or coarse grade either
as water repellent or water absorbent. The material used in this test was
Gro-Prod medium grade, water repellent.
The test was initiated July 15, 1988 at the CFREC-Apopka. Test plants
were Dieffenbachia 'Camille' and Schefflera arboricola growing in 6" pots.
Treatments included combinations by volume of Florida peat, pine bark and
Gro-Prod (Table 1). Plants were fertilized at initiation with 5 g Osmocote
19-6-12 per 6" pot. MicroMax (a micronutrient blend) was added to all
mixes at one pound per cubic yard. Dolomite, 7 pounds per cubic yard, was
only added to treatments containing no Gro-Prod since Gro-Prod has an
initial pH of about 8. Plants were grown in a glasshouse and received
about 1500 ft-candles maximum. Temperatures ranged from 70-90F and plants
were irrigated 3 times weekly. Experiment was terminated in November,
1988. Electrical conductivity (EC) and pH were obtained by the
Treatments did not affect height of D. 'Camille', and had only a
slight effect on height of S. arboricola TTable 1). Although plants
growing in Florida peat:Gro-Prod (FP:GP 9:1) were the tallest, increases in
amount of Gro-Prod reduced plant height and S. arboricola growing in FP:GP
(6:4) were the shortest plants. Plant grade-(Table 2) indicated that D.
'Camille' grew equally in pure FP or FP:GP (9:1). Grades of D. 'Camille'
growing in a mix with Gro-Prod at any ratio were equal to or greater than
plants growing in mixes containing pine bark (PB). Plant grade and height
of S. arboricola responded similarly to treatments. The best plants were
grown in mixes of FP:GP (9:1), and plants growing in FP:GP (6:4) had the
poorest grade. The medium containing Gro-Prod had the lowest pH, below 5,
indicating that dolomite is needed. Initial incorporation of dolomite into
mixes containing Gro-Prod might have produced even better plants. Although
there were slight differences in EC between the mixes, the difference was
not sufficient to explain differences in plant growth.
Summary. Medium grade, water repellent Gro-Prod shows promise as an
ingredient in potting media used for growth of foliage plants but Gro-Prod
should not exceed 10-20% of the soil volume. Dolomite should probably be
incorporated with mixes containing Gro-Prod, but at 1/2 3/4 the usual
1Professor of Plant Physiology and Professor and Center Director,
respectively, Central Florida Research and Education Center Apopka, 2807
Binion Road, Apopka, FL 32703
Table 1. Influence of various potting ingredients
on growth of Schefflera arboricola.
Ingredients Plant height, cm
FP PB GP July 28 Sep 14 Nov 8
10 0 0 10 20 33
9 0 1 12 34 37
8 0 2 11 20 31
7 0 3 11 21 32
6 0 4 10 16 26
9 1 0 11 21 35
8 2 0 11 23 34
7 3 0 11 22 35
6 4 0 11 20 32
"by volume; FP = Florida Peat, PB = Pine Bark, GP =
Table 2. Influence of various potting ingredients on plant grade of D.
'Camille' and S. arboricola and on pH and EC (micromhos/cm) of the~media of
Plant grade' D. 'Camille'
Ingredients Dieffenbachia Schefflera pH EC
FP PB GP 'Camille' arboricola July 19 Nov 21 July 19 Nov 21
10 0 0 4.6 4.0 5.2 5.6 2205 140
9 0 1 4.6 4.3 4.6 4.4 2130 88
8 0 2 4.5 3.4 4.6 4.4 2860 92
7 0 3 4.1 3.5 4.6 4.8 2765 72
6 0 4 4.2 3.0 4.7 5.0 2455 42
9 1 0 3.8 3.9 6.0 5.4 2120 106
8 2 0 4.2 3.9 6.1 5.6 1957 114
7 3 0 4.1 3.9 5.6 5.4 2205 108
6 4 0 3.7 3.9 5.6 5.2 1902 108
Zby volume; FP = Florida Peat, PB = Pine
Y1 = poor, 3 = salable, 5 = excellent
Bark, GP = Gro-Prod