10 Seeds Hydrangea Mix Flower Seeds Long Lasting Perennial Flowers all summer long .easy to grow perennial. Can be started indoors in winter 6-10. Weeks before your region's last frost to be transplanted outside in spring. Or can be sown directly into the ground in. Spring, summer or fall have always been valued for their showy 2-foot stalks of ball-shaped flowers that last throughout. The summer. They establish from flower seed for any garden. Are praised for being excellent cut flowers. With a long vase. Life, flowers will last up to 8 days, more when preservatives are added to the water. Blooms left on plant will last up to 2 months. Likes morning sun and afternoon shade.