I agree. I have clay-ish soil (live across the road from a lake) so it’s pretty good on water retention, but every FREE thing (like rainwater) I can get from Nature is a bonus.
We did the math at work. When we get a 1-inch rainfall, and it falls on an average home-sized roof, if you could collect all that water, it would be something like 92,000 GALLONS of water! From 1 INCH of rainfall. Simply amazing.
What can I plant that will grow up lattice but is not evasive and produces flowers for much of the summer? It is a full sun area.