That's interesting! How thick is your layer of compost? I usually give my plants a lot of compost, even though most of them are growing next to the compost bins.
One year, I fed all of them about 4-6 inches of horse manure. I'd been reading an herb book by Lesley Bremness, who recommended that comfrey be given "a bucketful of crude manure" in spring and early summer.
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