Incrediball Hydrangea Easy to grow; drought, insect, disease resistant, fast growing; grows about anywhere. Blooms from midsummer through frost. Butterflies love them. Reliable re-bloomer. Plant Hydrangea with good drainage and lots of compost to hold moisture. Plant your new bushes in morning sun only. Don’t prune, flowers form on the tips of the stems. Hydrangeas leaf out in spring from bottom to top along the stems. Bloom all season.