Vermiculture
Q.

Worm castings usage

Zone Oceranside, California | kaskastner added on December 16, 2015 | Answered

I have added worm castings to my Hibiscus and they thrive but I added also to a small Ficus tree (and two tangerine trees) and they no longer look as healthy as they were. Can the worm castings be the problem - maybe those specific plants do not like them?

A.
A.Answers to this queston: Add Answer
Downtoearthdigs
Certified GKH Gardening Expert
Answered on December 18, 2015

Yes, the worm castings could be an issue if they are applied to heavily.
For a small potted plant add approx 1/2" of worm castings to the top of the soil and water in. Repeat every 3 to 4 months.
For fruit trees add 2 cups of castings for every inch of trunk diameter.
Top dress the soil from trunk to drip line cover with mulch and water in.

https://www.gardeningknowhow.com/composting/vermicomposting/worm-castings.htm

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