4 ms·The best time to plant a tree is 20 years ago.by hypertele-Xii 6y agoThe best time to plant a tree is 20 years ago.simonh 6y agoThe second best time is now :)xattt 6y agoThe best time to get retroviral gene integration is hundreds of millions of years ago.dmos62 6y agoBest time to get in trouble is when you're already out of it.