Ask a Question forum→Rhododendron Color

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May 10, 2020 3:01 PM CST
I have lavender (light purple) rhododendrons. If I raise the acidity of the soil, will they change color ... a deeper purple or pink/reddish?
Name: Big Bill
Livonia, Michigan (Zone 6a)
American Orchid Society Judge
Region: United States of America Critters Allowed Growing under artificial light Echinacea Hostas Region: Michigan
Butterflies Lover of wildlife (Raccoon badge) Orchids Cat Lover Birds Bee Lover
May 10, 2020 4:16 PM CST
They are not like hydrangeas.
Rodney Wilcox Jones, my idol!
Businessman, Orchid grower, hybridizer, lived to 107!
Name: Luis
Hurst, TX, U.S.A. (Zone 8a)
Dog Lover Region: Texas Salvias Roses Hibiscus Plumerias
May 10, 2020 8:34 PM CST
In general, they do not react to soil pH. But this is an interesting subject because:

Some have blooms that darken as the bloom gets "older" like roses do.

If the plant were to be grafted (rare in the U.S.), the rootstock may produce a different color and form of bloom than the top (if the top were to die).

Sports can develop on a branch but not on a complete shrub all of the sudden.

Some small variation in color may occur in sandy soils due to mineral deficiencies.

Some revert back to their parents. To one degree or another. Azalea George L. Taber occasionally throws out a solid purple-flowered branch... because that is where it originated... as a sport. Bi-color Encore Azalea Autumn Twist, which has some flecks- will occasionally throw full white or full purple blooms..
[Last edited by luis_pr - May 11, 2020 2:00 AM (+)]
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