Regrowing an indica after harvest by leaving the lower branches and switching back to eighteen hours of light gives a second crop from the same seed without germinating anything. The first few weeks look strange, with single bladed leaves and slow growth, and the plant takes about a month to behave normally again. Which strains reveg cleanly and which ones sulk for two months is tracked by members on https://kushindicaseeds.com from their own attempts. I only bother with plants that were clearly better than the rest of the pack.