At times, prairies in east-central Nebraska can have such an abundance of large wildflowers, they resemble flower gardens. Early spring is not one of those times. There are plenty of prairie flowers blooming this spring, but you wouldn’t know it from a distance. In fact, it often seems as if you have to nearly step on a spring wildflower before you see it.
In the coming weeks, things will change. Late spring and early summer flowers such as ragwort (Senecio plattensis), shell-leaf penstemon (Penstemon grandiflorus) and spiderworts (Tradescantia spp) will be displayed at the top of stems that rise a foot or two from the ground. Clusters of those flowers can easily be seen from hundreds of yards away. For now, however, wildflowers are keeping a low profile.
Of course, short stature and small flowers make perfect sense in the early spring. Flowers that bloom at the beginning of the growing season don’t have much time between winter’s thaw and blooming time (especially this year!) The small plants are in a race to bloom before neighbors – especially grasses – overtop them, making it difficult for both pollinators and light to find them. For the most part, spring-flowering plants grow just long enough stems to get their flowers off the ground and make those flowers just big enough to attract pollinating insects.
While not universally true, many early flowering plants seem to thrive best when a prairie isn’t loaded with thatch and tall dead vegetation from previous seasons. Prairies burned during the dormant season or were grazed or hayed the previous summer/fall seem to have the greatest abundance of spring flowers. Of course, there is some observer bias involved in measuring that since spring flowers are much easier to see in short vegetation…
This spring, I’ve been paying particular attention to prairies that we burned and grazed during drought of 2012. Most were awfully short, brown, and barren-looking by late last summer and stayed that way through the winter. It’s been nice to see them greening up this spring and supporting good numbers of wildflowers. Interestingly, I’ve seen more wind flowers (Anemone caroliniana) this year than I can remember from previous springs. The two sites in which I’ve seen big patches of wind flowers were both burned and grazed pretty hard last year, making the flowers easy to see, but probably also allowing the plants to grow with little competition for light or other resources.
While spring flowers are short in stature, they seem to be able to attract pollinators. Of course, many of those pollinators are good at finding hidden plants by following their scent. In addition, when the number of flowering species is limited, pollinators do what it takes to find whatever flowers are available!
What’s more interesting to me is that as I’ve been seeing and photographing wind flowers over the last week or so, I’ve seen a surprising number of tiny crab spiders on them. I would guess that there’s a crab spider on one out of every 10-15 flowers, and they all appear (to me) to be of the same species. I wish I knew how those crab spiders found the flowers.
I’ve been seeing a lot of trailing silks in the air lately, so I know some spiders are on the move (by ballooning), and I assume young crab spiders disperse that way. But if they do, landing on or near a flowering plant at this time of year seems awfully unlikely. Are the crab spiders I’m seeing on wind flowers the lucky few that landed near a good hunting place? Or are most crab spiders able to find a flower to hunt on, even in the spring when flowers are scattered around in low numbers? If so, how?
Maybe one of you will be able to answer those questions for me. For now, I’ll just add them to my long list of other questions – a list that will surely grow considerably during this coming field season.