Using Heavy Clay Soil Without Amendment
Clay soils pack tightly, holding water like a sponge—terrible news for thyme’s craving for dry, Mediterranean-style loam and only slightly better for basil’s moderate moisture needs. I remember planting thyme in unamended clay and watching it sulk all season long!
Rescue clay beds by folding in generous amounts of compost, leaf mold, or well-rotted manure, and add coarse sand or horticultural grit for drainage. Your thyme will perk up in crumbly, airy ground, and basil will develop the deep green leaves we all crave.