If My Hydrangeas Don’t Bloom, How Do I Know If They Are The Type That Bloom On Old Or New Wood?

Question

I have 2 kaleidoscope hydrangeas and three of another type (don’t know what type). Some years we have prunes all old wood in the spring, and didn’t prune in other years. Doesn’t seem to matter; still no blooms.

Answer 1

If they do not bloom, it will mean that they bloom on old wood, and likely need several years of unpruned or unharmed growth to flower.

https://www.gardeningknowhow.com/ornamental/shrubs/hydrangea/hydrangea-not-blooming.htm