(Toledo, OH) My giant sunflowers have begun to blossom, despite the efforts of my children to suppress their growth with repeated thumpings-by-soccer-ball. This specimen is almost nine feet in height.
A series of heavy rain storms in late June and early July also took their toll on these plants. I believe that only six will reach maturity.
Interestingly, I have another half-dozen of these giant sunflowers whose growth was stunted by the place in which I planted them.
A tall pine tree shades the area in which they sprouted, denying them about four hours of sunlight in the morning. They get full sun from noon until dusk, but that apparently was enough to reduce their growth to about five feet in height.