Question about Concord grapes
I planted some Concord grapevines last June, and although they didn't bear, they grew well last year. This year, they started leafing out at the very end of March. I also planted 2 Delaware grapevines this year, and they have already started to show tiny flower clusters. However, the Concord grapevines don't have any flower clusters yet and are growing less vigorously than the newly planted Delaware grapevines. Is there anything to be concerned about at this point? When do Concord grapes usually start to bloom? Thanks for any info.