I have 2 prosperous 2-3 year kaffir lime leaf plants. In Wisconsin. Getting ready to take them in for the year and use a grow light until next spring. Hopefully, limes next year. But they have gone from dark to light green, despite growth. What to do? Is the potting? Is it missing an ingredient? Chelp! Todd ToddGreenberg@mac.com-- prefer a response to this email. Thanks!