Why isn’t my HYDRANGEA blooming? Posted on May 17, 2017, Edited September 16, 2019 by Chris Heckel There are many reasons your Hydrangeas could be having trouble this season. This handy guide created by Proven Winners can help you better understand your plants. Handy Blooming Diagnosis Sheet Download this handy printable guide to help you diagnose and care for your Hydrangeas. And of course, you are welcome to visit Johnston’s Greenhouse Garden Center at any time if you have more questions. Hydrangeas Demystified Tips for Success Moist but well-drained soil (hydrangeas will not tolerate wet feet – ever!) Some sun each day. Most people think of hydrangeas as shade plants, but they look and flower best with at least four hours of sun, ideally in the morning. Panicle hydrangeas are the most sun tolerant and can take full sun in northern climates. Plenty of water, especially as they are getting established. Hydrangeas have shallow roots, so they dry out quickly. A two to three-inch layer of shredded bark mulch is a useful addition to any hydrangea planting.