How does one go about using gypsum as a source of calcium for potted plants? I have a small amount left from my homebrewing days, but I'm unsure of the best application method. Should it be mixed in dry with the soil, or mixed with water and applied to the foliage, or.....? Searching has brought up the use of gypsum several times here and on the Google, but I can't seem to find any further info on potted plant use, other than a general recommendation to use it.
Thanks for any info!
Thanks for any info!