I gave the barrens a close examination and found the winter
annuals to be doing extremely well this year.
This Leavenworthia uniflora
rosette has a healthy cluster of leaves and at least four flower buds nestled
in the center of the whorl. That’s quite
an improvement over what I found last year.
The difference is the result of nearly no snow cover this winter, while
snow covered the ground most of the winter last year. Leavenworthia germinates in the fall and
grows throughout the winter. Snow cover
blocks the sunlight and slows the growth of the plant. After an especially snowy winter, both plant
numbers and size are decreased.
This is where the Leavenworthia grows. It sinks its long tap root as best it can
into gravelly limestone soil. A well
anchored root is essential to survive in a soil that alternately freezes and
thaws through the winter. As the soil
freezes, it expands and pushes upward.
Plants not anchored to the soil below the freeze line are pushed up and
left stranded on the surface when the soil thaws and falls back into place.
Plants that survive the rough winter conditions will flower
in the spring. Seed will mature before
the poor soil dries out in the summer sun.
Draba cuneifolia
has a life cycle like that of the Leavenworthia. Its small rosette of leaves is working hard
to turn sunlight into energy for that all important process of producing seed
for next year’s population. At this
stage, the tiny plants are almost impossible for a person to see from a
standing position. It’s necessary to get
your eyes close to the ground to find these plants. The cedar needles and dried grass stalks are
an indicator of the plant’s diminutive size.
The Drabas are also quite numerous this year. With luck, there should be a tremendous
amount of seed produced.
Still, the plants growing in the barrens don’t come close to
matching the tremendous growth displayed by my container bound population.
The Drabas are so crowded together in the container that
other plants have trouble competing. The
small pointy leaved plants are Chickweeds that are having trouble breaking
through to the sunlight.
Where the Drabas are not so crowded together, the individual
plants have attained a larger size. In
these areas, Leavenworthia is able to find room to grow.
The Leavenworthia is having trouble maintaining itself in
the container dominated by Draba. I have
already prepared a new container that will be solely dedicated to
Leavenworthia. When I originally put
these two species together, I was expecting them to behave as they do in the
barrens and just produce a scattering of plants. It’s obvious now that I was mistaken. I’ve been growing these plants in containers
for several years and seem to learn something new about their growth habits
every year.
I always love these posts. I know who to seek out when I need some rare mustard seeds :)
ReplyDeleteHi, Andrew. These plants are a couple of my favorite species. Of course, there are several dozen more that are also my favorites, so that designation encompasses a fairly large group.
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