I've never used a chemical fertilizer on mine. I planted them in good soil and use cocoa bean mulch. I turn the mulch back into the soil every year and that's it. The majority of mine get at least 6 hrs of sun from early morning until around 1:30 or so. Mine all have colored leaves. They've all grown really well. Some kinds of heuchera just don't get that big. The biggest I have is 'Ruby Veil'...big leaves, width and height. I've had them the longest too. Some need to be divided more than others, and after they get divided, they will get bigger.

Kat

Mine get fed what my hosta are fed....alfalfa pellets and a little bone meal about once a year....and they get huge....when the rabbits don't find them.
Linda C

I don't feed mine at all; I only have the 1970's old common variety that thrive in a full sun border. They, like all the rest of my garden beds, get a top dress of homemade compost in the fall.