My artificial barrens in a pot continues to evolve. Originally planted in the container were
Draba cuneifolia, Draba reptans, and Leavenworthia uniflora. Draba reptans persists in small numbers and
is hardly noticeable. Draba cuneifolia
and Leavenworthia uniflora aggressively compete for dominance of the
container. Since its creation, no two
seasons in this container have been the same.
In 2013, Leavenworthia uniflora dominated the
container. Last year there was a fairly
even mix of Draba cuneifolia and Leavenworthia.
This year the Draba cuneifolia is definitely in control. Draba flower stalks form a miniature forest.
A loose cluster of flowers forms atop the stalk. These plants are just beginning to
bloom. The flower spike will continue to
enlarge and the immature buds seen in the center of the cluster will be brought
into position to open.
A number of these small bees were busy visiting the Draba
flowers.
It’s unusual for the plants on the barrens to grow this
large. I’m certain that their growth
patterns are influenced by weather conditions, but I don’t know if it was
spending several weeks buried by snow or the excessive rainfall during the last
six weeks or some other factor that is responsible for the impressive growth
this year.
Draba reptans is also performing above expectations this
year. This plant toppled over, but that
won’t stop it from producing a good crop of seeds. Total height, or length, of this plant is not
much over an inch, so it didn’t have far to topple.
Draba reptans is similar in appearance, but smaller than
Draba cuneifolia. One characteristic
that separates the two is the hairiness of the flower stalk. The stalk on reptans is practically hairless,
while the cuneifolia stalk has a fuzzy hairiness along its entire length.
Drabas and Leavenworthias are blooming side-by-side in the
container barrens. Draba cuneifiolia has
a shallow indentation at the end of each of the four petals. Leavenworthia petals are all well rounded. A couple of non-native Draba verna have also
managed to invade the container. Seen in
the lower right of the photo, Draba verna petals are split almost in two, so
the flower appears to have eight petals instead of four.
This year’s Leavenworthia plants are quite tiny and have
only a single flower stalk. I’m afraid
they couldn’t compete with the rapid early growth of the Drabas.
Contrary to what I’ve noticed in past years, the
Leavenworthia growing on the barrens are much more robust than those in the
container.
Most of the barrens grown specimens are producing multiple
flower stalks. The seed produced from
these should be a definite boost to future generations.
The Draba cuneifolia in the container are going to make a tremendous
amount of seed. I’ll collect as much as
I can and scatter it out on the same barrens from which I originally gathered
the seed for this container collection.
If my original removal of seed from the barrens resulted in a diminished
population of Draba, I’m sure my replacement of seed has more than made up for
the loss.
The container plants are producing so much seed that I’m now
finding Draba cuneifolia growing in the cracks of the concrete apron outside my
barn door. I love it when a rare plant
begins to behave like a weed.
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