I bought my Heuchera ‘Obsidian’ from Lowe’s in the spring of 2014. It has very dark purple, nearly black, leaves. It produces creamy-white flowers in late spring through mid-summer on stems about 24” tall. I planted my new Heuchera, Hosta, and several Caladiums (etc.) in the new shade bed I made this spring (2017).
Heuchera ‘Obsidian’ is a Terra Nova® introduction PP14836. Information from their site says H. ‘Obsidian’ is the “Black Standard” which does not fade. They are a vigorous and consistent performer under a wide range of conditions.
Origin: Sun to part shade
Zones: USDA Zones 4-9 ° F
Size: 8-10” tall x 16” wide
Light: Sun to part shade
Soil: Prefers organic, moist, well-drained soil
Flowers: Creamy-white in late spring through early summer
Propagation: Can divide after 3 years
Although information suggests they do well in full sun to part shade, I have found their leaves burn in too much light. I prefer light to part shade and where I grow them they get a combination of both, depending on the time of the summer.
In mild winters, their leaves will remain evergreen but in cold winters they will completely die back. They are sensitive to frost heaving like Hosta so you may need to mulch your Heuchera AFTER the ground freezes. This will help keep there ground froze somewhat. Continual freezing and thawing will heave their roots up losing contact with the soil. They don’t need much mulch, though, because they still need good drainage over the winter.
Heuchera only require a little maintenance. Trim off dead or damaged leaves in the spring and throughout the summer. Deadhead spent flowers to keep them looking tidy.
Although they do like consistently moist soil, they do not want it overly wet. They become fairly drought tolerant once established.
As you can tell in the above photos, I get behind weeding the beds from time to time. There is always something to do here on the farm. As this new shade bed gets more mature, weeding will be a little easier.
The Heuchera ‘Obsidian’ made it through the winter just fine desipte a very cold January.
It seemed to off to a good start.
Cooler temps continued hanging around which made some of the perennials somewhat slow to grow including the Heuchera.
It seemed the Heuchera ‘Obsidian’ seemed to struggle a little.
All the Heuchera in the shade bed didn’t do so well except for the new ‘Lime Ricky’ and the ‘Palace Purple’ I moved to a new location. There were several factors which started out with the cold January, cool and lingering spring, and not enough rain. Then there was the Japanese Beetle invasion which turned the shady area into more of a sunny spot. That meant I had to water more frequently and sometimes I didn’t have enough time.
I am pretty sure the Japanese Beetles will be back in full force in June-July and I will have to deal with them again. I am thinking about moving the shade bed to the north side of the house, but that is only a possibility. Having the shade bed under Chinese two Chinese Elm trees has proved not to be a good idea for two reasons… One, the beetles love the leaves and pretty much strip the trees. Two, the moles eat the beetle grubs so they burrow under the plants leaving no soil under their roots. When watering, the water drains down into the mole runs.
So, unless I move the Hosta and Heuchera, I will continue to face the same issues in 2019.
There are MANY sources of Heuchera at local garden centers and online.
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