Heathcliff:
Hi, I'm propagating a lot of trees like Liquidambar, Japanese Maples, Bald Cypress, Pin, English and Cork Oaks but am having to liquid fertilize a lot. I'm using Searles premium potting mix and Seasol powerfeed.
Rather than this could I supplement the Searles with compost or composted manure? Say 1/5 to 1/3 depending on the species requirements? I'm not a perfectionist just need something a bit richer with better moisture retention. Thanks for any help.