Why Would 5 Of My 16 Russian Sages Loose Their Blooms Mid Season Zone 5?

Question

They were planted last spring in a rock retaining wall, 3′ x 3’holes were dug and filled with soil, underground irrigation 2 litres 2x weekly and bloomed all last summer.

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Answer 1

Likely, overwatering. These are pretty drought tolerant. They won't tolerate wet soils for long, though.

Here is an article that will help you to care for them:

https://www.gardeningknowhow.com/ornamental/flowers/russian-sage-flowers/russian-sage-care.htm