Ask a Question forum: Blue flowering shrub

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Altoona,PA 16601
DBarr
Jun 1, 2019 10:17 PM CST
I have a red flowering rhododendron shrub ,a white flowering shrub(forgot name) in front of house. Would like to add a blue shub to complete a patriotic theme.Plants are old, large, and well established.Might take a while for something new to catch up,but that's ok.
Any suggestions?
Altoona,Pa. Zone 6a.
Name: Daisy I
Reno, Nv (Zone 6b)
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DaisyI
Jun 1, 2019 11:22 PM CST
Blue is not an easy color to come by in the plant kingdom. How about a Hydrangea? You can buy a blue one and then with the appropriate food, you can keep it blue.
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Name: Sue Taylor
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kniphofia
Jun 1, 2019 11:41 PM CST
What about Ceanothus (Californian Lilac) which is a pretty good blue.
Name: Daisy I
Reno, Nv (Zone 6b)
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DaisyI
Jun 2, 2019 12:18 AM CST
A good one but not cold hardy enough.
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Altoona,PA 16601
DBarr
Jun 2, 2019 10:36 AM CST
Daisyl,sounds fine.
Thanx so much.
I have looked up some hydrangeas and it looks like some good choices are available.
Thanx again.
Name: Porkpal
Richmond, TX
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porkpal
Jun 2, 2019 11:26 AM CST
Plumbago would freeze back in winter but grow back from the roots - I think.
Porkpal
Name: Cheryl
North of Houston TX (Zone 9a)
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ShadyGreenThumb
Jun 2, 2019 11:39 AM CST
Yes, Plumbago is the most popular blue-flowering shrub here.
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Name: Luis
Hurst, TX (Zone 8a)
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luis_pr
Jun 2, 2019 12:59 PM CST
To get the red-white-and-blue effect, all the plants would have to flower at the same time. Do the rhodie and the unknown white shrub bloom at the same time. When exactly do they bloom?

You could add blue-ish annuals if necessary.

Another blue: agapanthus/lily of the nile.

Just a f.y.i... in the annuals section of a local plant nursery, I saw today these red/white/blue plants in a small pot: Lucia Dark Blue (lobelia erinus) with Superbells Red (calibrachoe), with Whirlwind White Fan Flower (scaveola aemula).

Mophead hydrangeas in PA may not be a good choice. Mopheads will require winter protection in order to bloom at the same or near the same time as many rhodies in the Spring. If you do not winter protect, the mophead stems and their blooms will probably get zapped by winter. If the mophead is a rebloomer though, the dead stems will not flower in Spring but the new stem growth will develop flowers late in the Summer or early Fall instead.
Name: Carol
Santa Ana, ca
Sunset zone 22, USDA zone 10 A.
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ctcarol
Jun 2, 2019 4:22 PM CST
Blue shrubs are scarce, but there are lot of blue Clematis in the Data Base. Delphiniums come in blues too.
Name: Lin Vosbury
Sebastian, Florida (Zone 10a)

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plantladylin
Jun 2, 2019 4:57 PM CST
I think Caryopteris (Bluebeard) are listed for zones 5 to 9 but they don't get real tall. We have quite a few listed here in our database: https://garden.org/plants/sear...

And a few random photos from the database:



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