Total Nitrogen (N) …………………………………………….16%
11.8% Ammonical Nitrogen
4.2% Urea Nitrogen
Available Phosphate (P205) ………………………….……..6%
Soluble Potash (K20) ………………………………….……….16%
Iron (Fe) …………………………………………………………..0.03% Chelated Iron (Fe)
Zinc (Zn) …………………………………………………..………0.05% Chelated Zinc (Zn)
Calcium (Ca)……………………………………………………..0.05%
Magnesium (Mg)……………………………………………….0.03%
Organic Humic ………………………………………………………8%
Derived from: Ammonium Hydroxide, Urea, Phosphoric Acid, Potassium Hydroxide, Iron EDTA, Zinc EDT
Inactive Ingredients …………………………………………53.84%
Total ……………………………………………………………..100.00%

*Derived from: Ammonium Nitrate, Potassium Phosphate, Potassium Nitrate, Magnesium Sulfate, Boric Acid, Calcium Carbonate Copper EDTA, Iron EDTA, Manganese EDTA, Sodium Molybdate, Zinc EDTA. ** Brown sugar derived from organic sugar cane extract.


  • Weekly application of 2401-600 ppm nitrogen
  • Constant feed of 90-255 ppm
  • New research show constant feed at 100-150 ppm adequate with less leach
  • Categorize crop according to need


  • Phosphorus may not be needed if pre-incorporated or soil-based
  • May not know how much is in a commercial medium
  • Do not know the rate of leaching
  • May be growing using long-term crop
  • Usually add P2O5 equal to 1/2 the N


  • Most plant species do well with 1 N : 1 K2O
  • Exceptions Include:
    • Azalea (3:1)
    • Elatior begonia (2:1)
    • Foliage plants (1.5:1)
    • Carnation (1:1.5)
    • Cyclamen (1:2)


Total Nitrogen-PPM 50 100 150 200 300 400
16-6-16 Ca-3 Mg 0.39 0.78 1.17 1.56 2.34 3.12

In this piece basic fertilizer programs are recommended for the most important crops currently grown in various greenhouses. An individual grower may need to “fine-tune” these recommendations to fit his/her conditions, but in doing so the following factors, which interact to affect the response of containerized plants to fertilizer, should to be kept in mind:

  1. Fertilizer type. Important considerations are ratio of ammonium to nitrate-N, trace element charge, content of calcium and magnesium, and potential acidity or basicity. 
  2. Fertilizer rate. Traditionally fertilizer rate (ppm) has been the main focus of greenhouse fertilizer programs, but rate interacts with the other five factors on this list to determine the success of a fertility program.
  3. Frequency of application. How many times water-soluble fertilizer is applied is often overlooked as a factor in developing a good fertilizer program. What does the term “constant liquid feed” really mean- every watering, once a week, or twice a week? At a given PPM level, more frequent applications will lead to a high fertility level simply because fertilizer is applied more often.
  4. Volume of fertilizer solution applied. As the volume of water soluble fertilizer increases the quantity of nutrients delivered to the plant increases. Doubling the volume applied also doubles the amount of each nutrient potentially available to the plant.
  5. Leaching fraction. Leaching fraction is the proportion of fertilizer solution or irrigation water applied that is lost from the plant container by leaching. The lower the leaching fraction, the greater the quantity of nutrients and salts retained in the growth medium. Leaching fraction is strongly affected by volume applied (i.e., factor 4).
  6. Plant growth rate and environmental conditions. In general, nutrient requirements of floriculture crops are greatest during periods of rapid growth. Two major influences on growth rate are the inherent growth pattern followed by the plant and the environment in which it is grown. Too much fertilizer during slow growth periods may lead to excess soluble salts; Failure to proved enough fertilizer during periods of rapid growth will lead to deficiency

Zonal – 5.8-6.5, Ivies- 5.3-6.0, Floribundas- 6.2-6.5
FERTILIZER TYPES: 15-5-15 (Geranium Special), 15-16-17 Peat-lite, and 20-10-20 Peat Lite. Excel Cal-Mag 15-5-15 could be used as a supplement limestone to add Ca and Mg.
FERTILIZER RATES AND STRATEGY: 200-250 ppm N CLF or 150-200 ppm N with sub irrigation or another restricted leaching system. Begin fertilizing at planting. Monitor salts and pH, particularly for Ivies. Remove saucers from Ivy baskets to allow adequate drainage.

  1. All Geranium types are intolerant of high soluble salts.
  2. Zonals and Floribundas are susceptible to Iron (Fe), Manganese (Mn) toxicity. The higher pH range for Zonal and Floribundas reduces the availability of excess Fe and Mn.
  3. Ivies often show interveinal chlorosis due to Fe or Mg deficiency. Mg occurs on the lower leaves first; Fe deficiency genrally occurs on the youngest leaves first.
  4. Edema of Ivy Geraniums is mainly caused by too much water, high humidity, and/or poor drainage. Howerver, low N, P, MG, and Fe; pH above 6; and/or high EC have been linked to the problems as well.
  5. Boron (B) deficiency was a major problem for zonal geraniums in the past, but it seems to be rate today. Upper leaves become chlorotic and show necrotic lesions on the undersides. The leaves easily fall off with slight pressure. Probably the common practice of using water-soluble fertilizers containing trace elements has greatly reduced the occurrence of this problem.

6.0-6.5 (With some exceptions)
FERTILIZER TYPES: 15-0-15 Dark Weather Feed, 15-15-15, 15-16-17, 20-10-20, or EXCEL Cal-Mag 15-5-15.
FERTILIZER RATES: 200-250 ppm N. Less during plug culture (50 ppm Stages 1 and 2, 100 ppm stages 3 and 4).
FERTILIZER STRATEGY: Begin fertilizing vigorous types shortly after transplanting. Small, slow-growing species should receive lower rates or less frequent application until they are well-established. Cut fertilizer rate in half at visible bud or about 2-3 weeks from sale (do a soil test!).

  1. Excess soluble salts in seedling or early transplant stage. 
  2. Iron/manganese toxicity. Marigolds, seed gernaium, and common impatiens are most susceptible to this disorder characterized by bronze speckling to the leaves. This problem is most likely to occur when the growth medium pH is lower than the recommended range.
  3. Iron deficiency. Pansy, Petunias, Super Petunias, Snaps and Vinca are prone to Fe deficiency. These palnts should be grown at lower than the recommended pH.
  4. Boron or Calcium (Ca) deficiency in plugs. Abortion of the growing point may indicate low B or Ca.
  5. Ammonia toxicity. Pansy, Petunia, Tomato and Geranium are especially sensitive. Ammonium will not be a problem if Peat-Lite fertilizer are used.

FERTILIZER TYPES: 15-5-15, 15-16-17, 20-10-20.
RATES AND FERTILIZER STRATEGY: New Guineas cannot tolerate high soluble salts during the first 3-4 weeks after potting. High salts can be avoided by using the following strategy:

  1. Weeks 0-3 No Fertilizer
  2. Weeks 4-8; 100-22 ppm N
  3. Weeks 8-finish 200-250 ppm N

Rate (ppm) and frequency of application interact markedly to affect final size and quality. In general, it is best to use low fertilizer rates and make no more than two applications per week.

  1. Over fertilization (High EC) right after planting will slow the growth of plants and inhibit branching. Also, too much fertilizer may reduce flower number. 
  2. Fe and/or Mn toxicity. The best way to prevent this problem is to keep the pH above 5.8. Over fertilizing may aggravate this disorder.
  3. General nutrient deficiency (N deficiency). New Guineas show some chlorosis, reduction in leaf size, and leaf twisting or curling when N is deficient. This problem could develop if low nutrition is carried on too long.

5.7-6.2 (soilless) 6.3-6.7 (with 25% soil).
1-Liquid Fertilizer (15-5-15, 20-10-20) – 250 ppm N CLF or 350 ppm one application/week.
FERTILIZER STRATEGY: Begin fertilizing at planting, but monitor EC to avoid excess salts. Reduce fertilizer when buds show color. Stop fertilizing three weeks before sale but do a soil test first! Sometimes, late in the crop, a water-soluble fertilizer maybe needed to supplement CRF to prevent N deficiency.

  1. Excess soluble salts early. This problem is commonly the result of large applications of CRF. Try to distribute CRF evenly around the plants and don’t allow the pellets to come in contact with the tender cuttings.
  2. Late season nutrient deficiency (mainly N). This occurs during very warm summers with high rainfall or irrigation. The deficiency probably reflects the fact that the CRF is exhausted and/or the nutrients have leached.

In the greenhouse: Plugs or seedling transplants are grown-on using liquid fertilizer at the same rates and strategy recommended for bedding plants. Lower rates (100-150 ppm N may be best for slow-growing species or types prone to “rank” growth.
OUTDOOR CONTAINERS (with over wintering): Use the same water-soluble 15-5-15 fertilizer program as in the greenhouse or the CRF program used with fall mums

  1. Fertilize according to growth rate to avoid excess soluble salts, nutrient deficiency, or too much growth. 
  2. Do not fertilize late in the season as the plants approach dormancy. Curtailing fertilization encourages root growth and helps harden the plant to resist low temperatures.
  3. Do not begin fertilizing in the spring until the new growth begins and the danger of frost has passed.

Applying fertilizer too soon may make the plants susceptible to injury from spring frosts or cold spells.

pH: 5.8-6.2
FERTILIZER TYPES: 15-0-15, 15-16-17, 20-10-20, or Excel Cal-Mag 15-5-15.
FERTILIZER RATE: 200-300 ppm N with 250 ppm average. If sub irrigation or another restricted leaching system is used no more than 200 ppm should be used. 100-150 ppm N is possible with no leaching and frequent application.
FERTILIZER STRATEGY: Begin at planting and continue 2-3 weeks before sale and stop. Calcium is most critical during bract expansion to avoid bract necrosis. Magnesium and molybdenum deficiencies are most likely in November.

  1. Calcium deficiency: Bract edge bum and leaf edge necrosis (stock plants) are disorders linked to Ca deficiency. Ca deficiency can prevent by using Excel Cal-Mag or 15-5-15. (Do not use 15-0-15 for long periods with soil less growth media containing no phosphorus fertilizer).
  2. Magnesium deficiency: Interveinal chlorsis of the lower leaves on the breaks is the main symptom. Mg deficiency can be prevented by Excel 15-5-15 Cal-Mag or optional monthly application of magnesium sulfate at a rate of 1-3lbs per 100 gallons.
  3. Molybdenum deficiency: Interveinal Chlorosis and marginal necrosis occurs on the recently mature leaves and middle-aged leaves. This problem seems to be rate nowadays, but remember that Heggs’ and Lilo’ are quite susceptible. The best way to prevent this problem is by maintaining the recommended pH and the regular use of “peat-lite” fertilizers.
  4. Ammonium toxicity: This is another cause of interveinal chlorosis. This problem is corrected by using 50% Nitrate-N.

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Eyes: Immediately flush eyes with plenty of water and continue for at least 15 minutes, occasionally lifting the upper and lower eyelids. Get medical attention if irritation persists.
Skin: Flush affected areas with plenty of water. Get medical attention if irritation persists.
Ingestion: If this product is swallowed, do not induce vomiting. If vomiting occurs, keep head below hips to prevent aspiration (breathing) of liquid into lungs. Get medical attention immediately.