Winter annuals normally germinate in the fall, slowly grow basal rosettes through the winter, send up flower stalks in the spring and then wither away. Seeds lie dormant through the summer heat and germinate when temperatures begin to cool.
I’ve noticed that the Draba cuneifolia seed left in the pot
from the previous year’s plants, actually germinates in late summer. This year, I noticed seedlings in the middle
of August, during a period that was showing no signs of cooling. Those seedlings have grown rapidly and
threaten to cover the gravelly surface of my manufactured barrens with a carpet
of blue-grey plants.
This is a close up view of some natural barrens in which I
annually find Draba cuneifolia. The
puzzling thing is that I have never found any Draba seedlings here in the fall. They don’t present themselves until February
or early March.
I spent about an hour yesterday searching back-and-forth
across the barrens for any sign of Draba seedlings. I found none.
The reason why they develop so early in my container remains a
mystery. The container gets no special
consideration during the summer. It
endures the same weather conditions and exposure to sunlight. It may be that the concentration of seed is
so much higher in the container that early developing plants are easier to
see. If my container plants don’t suffer
from crowded conditions, I should have an abundance of seed produced next
spring. I may transfer a large quantity
of that seed to a small section of the natural barrens to see if that results
in early plants in the natural environment.
No comments:
Post a Comment