21-5-20 All Purpose LX
Product #77990
description & key benefits

This is the ideal fertilizer for moderate to high alkalinity water. This complete formula keeps magnesium and phosphorus soluble in concentration giving the grower ultimate flexibility when adjusting their nutrient program. It can be tank mixed with 15-5-15, other Jack's LX formulas as well as Calcium nitrate and or magnesium nitrate.

for use on

All bedding and potted plants, can be used for plugs at low rates

growers who want

A General Purpose formula that is potentially acidic. Great as a lower P alternative to 20-10-20.  Very flexible formula that can be tanked mixed with other LX blends without reducing micro nutrient concentration.


mixing instructions

Chart displays the amount of dry fertilizer (oz.) to add to each gallon of water to make a concentrated solution. Please check your injector setting before use.

Limit of Solubility = 4.5 lbs per gallon

Important Notes:

E.C. value is the best method to determine fertilizer strength. Fertilizer appearance may vary in color due to variation in raw material size and tracer dye distribution upon the particles in the bag. In solution, color will remain consistent.

For best results, use warm water to dissolve product. Jack's fertilizers are made with 100% soluble raw materials that will form a true solution. Some raw materials are slower to dissolve than others. Keep stock tank covered to reduce light and debris inputs. 

JR Peters, Inc. 

6656 Grant Way,
Allentown, PA, 18106
Toll Free: 866-522-5752
email: info@jrpeters.com


Having trouble?  That’s where we shine.  The lab and manufacturing facility at JR Peters is literally within steps of all of our staff.  We all work together to solve our growers problems and produce the highest quality products.  Our turnaround time for samples is about 3 business days - that means we can get you real answers if and when you run into bumps along the road.