Agave havardiana

Very hardy but susceptible to fungal attack !! We do not offer this species because in our experience the plant does not adapt well to hot and humid zones. After attempting to grow it on numerous occasions we find it susceptible to fungal attacks, especially during cool moist periods. In our attempts at growing this species the plants will grow moderately well during the summer growing season but then crash in the fall and winter dormant periods, or during prolonged rain events. It is our experience that the lower leaves turn black and mushy due to fungus, making the plant unsightly for long periods of the year, sometimes weakening the plant to the point of death. Others in our region may be successful at growing this species but we no longer attempt its cultivation. If you live in a hot, humid region and have attempted to grow this plant (successfully or not), feel free to leave feedback of your experience in the form at the bottom of this page . This very cold-hardy agave has medium-sized rosettes that are densely packed with glaucous-gray leaves.
the Davis Mountains of West Texas
6b to 9
3 feet x 3 feet

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Notes and observations about this plant

hot and dry
No problems growing in North Central Texas where it is hot and dry. This year I have one finally blooming! (Posted on 5/18/2014 by Denise Matysek).
No problems at all in NC
I grow this variety in NC no problems at all. (Posted on 3/30/2014 by peter alston).
Variable results
I find it curious this plant has a mixed reputation for fungal issues because of where I grow and what it has tolerated for me. Mine has grow very well in Tallahassee Florida were rain and humidity levels are far beyond its native habitat. In addition, it is has been subjected to additional spray from low volume irrigation regular often heavy morning dews and in some cases fair amounts of shade while still growing beautifully for about 10 years. I was impressed with its adaptability a while ago so it is curious to read that this experience is variable. (Posted on 10/13/2013 by Alani Davis).
Balcones Uplands
Harvardiana grows very well for me here in Brackettville, but I'm 2 hours west of San Antonio. We get high relative humidity but infrequent rains, and mine are planted in relatively thin, rocky soil on a limestone base. No evidence of fungal issues in my area. I have friends growing this in the Boerne area, so this plant probably will do well anywhere in the Balcones uplands west of San Antonio and Austin. (Posted on 9/5/2013 by Troy Hibbitts).

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