Arbor Care 15-8-4

Arbor Care 15-8-4

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Product Overview

Arbor Care 15-8-4 is specially formulated to provide your trees, shrubs, ornamentals, particularly evergreens an ideal solution to help them grow healthy and strong. It features 40% slow release Nitrogen that is derived from a unique nitrogen-containing molecule known as methylene diurea which has a long and smooth nitrogen release curve. It helps extend the Nitrogen release period between 3 to 6 months when used for deep root injection, depending on the condition of the climate and soil. It is equally effective when used as foliar spray as it is easily absorbed through leaves and roots. It also contains just the right of Phosphorous and Soluble Potash, along with essential micronutrients Copper, Iron, Manganese and Zinc which are vital for the development and health of plants. It has low salt index so it is guaranteed safe to use with no danger of phototoxicity, plus it won't cause clogging or abrasion on your equipment. It is compatible with most pesticides and can be mixed and sprayed in single application.

Features and Specs

Active Ingredient Total Nitrogen (N) - 15% Available Phosphate (P2O5) - 8% Soluble Potash (K2O) - 4%
For use in Trees, Shrubs, Ornamentals, Evergreens
Application Applied from Early Spring to Early Summer
* See Label for complete application instructions
Pet safe Yes, if used as directed on Label
Formulation Professional Product
Shelf Life 2 Years
Special Features Features Smart Nitrogen, a slow release nitrogen (SRN) with an exceptionally long and smooth nitrogen release curve
Shipping Weight 27.62 lbs
Manufacturer Growth Products (Mfg. Number: FTS20330)



I just opened a bottle of 15-8-4 Arbor Care and it smells more like ammonia than it usually does. Is that bad?

  • No. When a fertilizer sits in the sealed container for a long period of time, the ammonia smell gets stronger. Free urea turns into ammonia over time, and while the container is there is no escape for the gas.

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If I'm applying a root injection and my DBH is 11, am I really applying 55 gallons of Arbor Care 15 - 8 - 4 per tree?

Root Injection rates for Arbor Care 15-8-4 are as follows:

Arbor Care should be injected into the top 4 in. to 8 in. inches of soil where feeder roots extend. Start application of fertilizer approximately 2-3 feet from tree trunk and extend the same distance beyond the drip line. A grid pattern should be laid out, and spacing should be every 2 1/2 ft to a depth of 4 in. to 8 in. A minimum of 5 gal. of tank mix (solution) should be applied per inch of tree diameter. Inject approximately 1/2 gal. of fertilizer solution at each point. Please see the label for complete application instructions. 

You will use 89 oz to 2 gallons of Arbor Care per 100 gallons of solution. So if you need to make 55 gallons of finished solution, then you are using 49 oz of Arbor at the low rate and 140 oz of Arbor care at the highest rate.

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Can Arbor Care 15 - 8 - 4 be used as a drench application for my trees, shrubs and raised garden?

Arbor Care 15 - 8 - 4 can be applied as a foliar spray or as a soil injection. We do not recommend applying this as a drench in the soil since that likely would not be able to reach the roots. Please refer to the product label here for complete application directions and rates.

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Can Arbor Care 15 - 8 - 4 be applied to a lawn?

I have 1/2 and acre and was interested in trying this. Would applying the foliar rate suggestion on the label work for cool season lawn turf?


No, Arbor Care 15 - 8 - 4 is only labeled for use on Trees, Shrubs, Ornamentals, or Evergreens, it is not labeled to be used on lawns.  We do have Lawn Fertilizers that are better options.

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Any advice on how frequently to apply to ornamental evergreens?

If using in a foliar application, how frequently would you recommend applying this during the April-July growing season? Monthly feels right, but I'm wondering if foliar applications call for more frequent applications?


We apologize but we do not see how often the Arbor Care 15 - 8 - 4 should be applied on the product label.  It will vary depending on the amount you are applying and the amount of nitrogen needed. Please contact the manufacturer for more detailed information. You may reach Growth Products at 800-648-7626.

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