i think its for flowers 2 help with hybrids,like bury some by a red and yellow rose and u might get a orange 1,some of the bald spots that u started the game with will never grow grass
I usually don't TT but I spent all day yesterday TT'ing anyway because I also wanted to regrow my grass. I put flowers all over my dirt patches and watered my flowers without stepping on the muddy parts. (easy with a golden watering can). After slowly TT'ing for about 2-3 weeks my town is green again. Keep in mind that there are several permanent dirt patches on which no grass will grow.