Hardy and Tender Annual Flowers
I am frequently asked which flower varieties are hardy enough to plant in April and which tender flowers I should wait to plant until May. There are two reasons to wait until May to plant the tender annual flowers. 1. There is a good possibility of frost occurring until the end of April. 2. Tender annuals are heat loving. They tend to become stunted under cool growing conditions. Later planted ones often pass up the earlier planted ones.
Hardy (Cool) Annuals (plant in March and April)
Flowering Kale )
Tender (Warm) Annuals (wait until May to plant)
Moss Rose (Portulaca)
Nicotiana (Flowering Tobacco)
Schizanthus (Butterfly Flower)