Agastache, trouble?

Agastache may be my favorite genus of flowering plants: fragrant leaves, tubular flowers all summer that keep the hummingbirds happy, and pretty much carefree. The only problem I've ever had with Agastache is they sometimes won't make it through our wet winters -- other than that, just ignore them!


Until I got Agastache 'Bolero' this year.

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You see, this plant has a powdery mildew problem!



Did I ever mention that the first specimen I planted died, and that this is the replacement plant? (Still under warranty, thankfully)


Now maybe it's the fact that this is in a new bed, and perhaps the soil is not conditioned properly. Or maybe this area doesn't get quite as much sun as I thought it did (notice that the leaves have lost much of the purple color that made this so attractive in the first place).

Whatever the reason, why can't this plant be more like it's siblings, Agastache rupestris:


or even Agastache foeniculum:


Both of which have never shown any problems, mildew or otherwise.


Anybody else finding 'Bolero' to be a bit finicky? Any idea what the problem could be?

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sandy lawrence –   – (August 16, 2013 at 12:12 PM)  

I've had glorious results and total disasters with the Agastaches. I think my problem ones occurred when there was some clay in the soil. I know they like excellent drainage, but I think they also dislike clay?

HELENE  – (August 16, 2013 at 8:25 PM)  

I don't grow Agastache but I have other plants prone to mildew. I use a systemic organic fungicide, applied once a month, doesn't harm the environment or the plants, it helps a lot and keeps the mildew at bay. I am sure you can find a similar product where you live.

Gerhard Bock (Bamboo, Succulents and More)  – (August 17, 2013 at 12:56 PM)  

I have agastaches growing in clay soil and they're totally happy as long as they get full sun. I've never had a problem with powdery mildew on my agastaches but our lilac has powdery mildew every summer. It doesn't seem to harm it otherwise and none of the plants around it have gotten it.

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