As far as bulbs….most of the spring blooming bulbs like tulips, daffodils, hyacinths, and crocus all needed to be planted in fall. You could still sell them but if you want to sell bulbs to be planted now you will have to go with more summer blooming bulbs.
Gladioli, cannas, ranunculas, liatris, crocosmia,calla lillies, asiatic lily bulbs, caladiums, or dahlias all could be sold for summer.

One thing great about the timing of Mother’s Day you could sell almost any kind of annual flowers.
Pansies or violas, alyssum, salvia, verbena,snapdragons, mini gem marigolds, impatiens, …of course….petunias, lobelia, even ornamental grasses…no end to the possibilities to what you could sell .
Good luck!

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