Why don't my HYDRANGEAS have any blooms on them this year?

Question

They are Endless Summer variety and I have pruned them the same way every year. I'm confused. They are big, healthy shrubs that look great, just no blooms yet. Very disapointing; especially when my next door neighbors are HALF the size and half numerous blooms! I don't get it! HELP!!!

Answer 1

Some varieties don't bloom year after year. The Mophead (rounded) varieties are notorious for not blooming year after year.
Also, a lack of blooms could be due to pruning at the wrong time.
There may be a general lack of Phosphorous in the soil, & too much Nitrogen may have caused a lot of leafy growth at the expense of blooms.

Or...sometimes hydrangea will leaf out early in the spring during a warm spell and then get caught in a late spring freeze. If the new growth came only from the ground, then types of hydrange that blooms only on old wood will not bloom this year.

The smooth hydrangea (Hydrangea arborescens), bloom on new wood so if you prune in late winter or early spring, you won't accidentally cut off this year's flowers. Others, like some mopheads and many big-leaf hydrangeas (H. macrophylla) bloom on old wood, so any late-season (or fall or winter) pruning you do erases next year's flowers.
You can "prune a third of the stems of mophead hydrangeas (H. macrophylla) to the ground after blooming and cut off flower heads when they become tattered. But do not prune the flowerless straight shoots without side branches because these are the ones that will branch out and flower next year."*

'Endless Summer' is type of mophead hydrangea that will bloom no matter when they are pruned, & will regenerate the bloom bud even if the spring frost destroyed its old blooms. Your hydrangea might have been hit by frost & now may be trying to bloom on new wood. Your neighbor's hydrangea might have a head start over yours because it may be blooming on old wood that was protected from frost. Or maybe your neighbor has a different type of hydrangea?

They are heavy feeders. To encourage flowering, use a fertilizer low in Nitrogen and with a Phosphorus content over 30. (An N-P-K ratio of 10-40-10 is ideal) & fertilize them regularly. Organic soil enriched with compost is best. If using store-bought fertilizers & you don't want to fuss with a scheduled feeding of fertilizer, you can also use a slow-release fertilizer like osmacote or use manure around your plants. Water on a regular basis.

Too much shade will also retard the development of flowers. Full sun can scorch the leaves so part sun to shade is best. Morning sun and afternoon shade is ideal. In frost zones, winter protection & planting in an area away from drying winter winds helps.

Here's a forum that discusses your question of "Why Won't Endless Summer Bloom":
http://forums.gardenweb.com/forums/load/hydra/msg072212314133.html

Good luck! Hope this helps.

Answer 2

i can tell you this much about them,they are very picky as plants go about thier growing conditions,read up on line,i have many customers who grow them and they all groan about missing the cool blooms on bad years,i have seen some on the same property look awesome while others maybe twenty feet away looking bad,this is a plant you need to readup on and pay attention to

Answer 3

All of mine have bloomed abundantly. We did have a very weird spring in many areas, though.....perhaps that screwed up their cycles.