Page 19 - Griffin Gazette Issue 2 - 2018
P. 19
100% Water-soluble fertilizer (WSF) program:
ICL Specialty Fertilizer Tip Sheet for Fall Mums
• Ideally fertilizer selection should be based on
a current water analysis (contact your ICL
representative for more details).
• A good general program would be Peters
Professional 15-5-25 @ 200 to 250 ppm N
®
on a constant basis. Peters Excel 15-5-15 is
®
appropriate where a steady supply of calcium and Keep Hydrangeas Blue
magnesium is needed.
• Lower concentrations will work if little leaching
occurs from the drainage holes during fertigation. all Summer Long
• Commence feeding at planting or as soon as
cuttings are rooted.
• WSF applications should be reduced after bud
formation – either cut fertilizer concentration in
half or clear water every other watering.
100% Controlled-release fertilizer
(CRF) program:
• Osmocote Plus (5-6 mo. in N. zones/ 8-9 mo. in
®
S. zones) incorporated at 10 to 12 lbs. / cu. yard.
• Media should be used within 2 to 3 weeks after
mixing in CRF.
• Monitor EC in root zone in first few weeks
especially if temperatures are high.
• Select a longer term product to extend feeding in
the garden center and to help plants establish in
the landscape.
• CRF will reduce nutrient loss to the environment
and save cost & labor.
Combination fertilizer program:
• Osmocote Plus (5-6 mo. in N. zones/ 8-9 mo. in
®
S. zones) incorporated at 5 to 8 lbs. / cu. yard.
• Fertigate with Peters Professional 15-5-25 @
®
100 to 150 ppm N on a constant basis up until
bud set.
Blue-Max with E-Max Technology
™
Specially formulated for use in the production of blue
Supplements:
variety Hydrangeas.
• Add Magnesium in form of Peters Excel
®
Magnitrate 10-0-0 @ 4 oz. / 100 gallons on a Blue-Max™ features new polymer-coated E-Max Release
constant basis if Mg is lacking in program. Technology™ that conveniently delivers controlled
• Monthly applications of Peters Professional release Aluminum Sulfate (Al) to create and maintain the
®
Liquid STEM™ at 2 fl. oz. / 100 gallons will desired blue color of hydrangea flowers. With this coated
promote deep green foliage. approach, growers can deliver a sustained supply of
Al to the plant in a safe and reliable manner. And unlike
• Apply a medium rate of H2Pro™ Greenhouse and with drenches, the consistent release within specified
Nursery Wetting Agent Liquid before shipping to longevities eliminates the need for repeated applications,
help prevent wilting in the post-harvest phase. saving time, labor and ultimately dollars.
Problem solving: Item: 67-1605 Size: 50 lb.
• If using 100% WSF, need to fertigate after heavy
rainfall to replenish leached nutrients.
• As temperatures cool in the fall, purpling due to
cold induced P deficiency are often seen. This
usually dissipates if temperatures warm up.
Griffin Gazette 2018 | 19