Repotting and a little fertilizer, plus supplementary water when it doesn't rain for a week or two. Our fall, winter, and spring are relatively dry here, other than the ever-present humidity (which is also generally less in the cooler seasons). I prune to thin the overhanging oak tree branches to give a little more light to the shade lovers, and that's about it.
I give it a tablespoon of Osmocote in fall, another in February when it starts to warm up, and another at the end of May. We are restricted from use of fertilizer in the summer months here anyway, as it rains so hard and the soil is mostly sand the fert ends up in the rivers and the Gulf. So County ordinance forbids fertilizing between May 30 and Sept 30. Everybody then just makes use of slow-release pelleted fert to last through the summer anyway, but that's what we should be using so it's worked out well.
