I am curently growing micro sword (not exactly sure which one) in 1wpg in the short term. It's in a holding tank I use for plant clippings till I can take them to the LFS
to trade. It has started to spread already. Never tried giant hair grass in less than 3wpg, so not sure there. As for wysteria like Zezmo said it normally is a weed under good lighting. I have some in a 10gal with 2 20W CF
and it grows maybe 2-3 inches every couple of weeks though.