Puts iron and fertilizer right at the root level
Ross Green-again Iron Fertilizer is for use with Ross Root Feeder (, sold separately). 5-35-10 N-P-K rating, +2.4% iron.
For new trees, use 1 refill cartridge for every 2 feet of tree diameter.
For established trees, use 2 cartridges for every 1 inch of trunk diameter.
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