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Re: Help on groundcovers - marrubium

Here in the colder part of zone 7, I grew Marrubium rotundifolium with no
protection in a sand holding bed for a number of years.  Then, I moved it
to one of my borders and it only lasted through one fairly mild winter.  I
think the secret was the sand and excellent drainage.  The border I put it
in drains well; is, in fact,  a bit dry for some things...but I think the
organic matter in the border held too much moisture around the plant's
crown during our wet winters and that's what did it in. 

Clausen and Ekstrom in "Perennials for American Gardens" rate M. incanum
(candidisiumum) hardy from USDA zones 3 to 10.   They don't mention
rotundifolium.   I think M. rotundifolium is likely fairly hardy, it just
can't stand a lot of winter wet.  Give it a try, but grow it in sharp sand.
 Lovely plant and I mean to replace it one of these days.

Marge Talt, zone 7 Maryland
mtalt@clark.net
Editor:  Gardening in Shade
http://www.suite101.com


Dottie, Cincinnati, OH 5a wrote:
> >New on perennial list and need help.  Visited the Denver Botanic Gardens
> last
> >month and saw a ground cover that was in their water conservation
garden.
> >Label on it indicates name is Marrubium Rotundfolium.  It spreads in a
> >creeping fashion.  Has small round slightly cupp-shaped leaves.  Color
is
> >gray-green with whitle around the edges.  Looks like a succulent.   Need
to
> >know if it will grow in 5a, haven't been able to find it in my somewhat
> >limited
> >stack of perennial guides.  Is part of the name missing or a common name
I
> >can find in catalogs?  Any help would be welcomed.


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