Draba Barrens Check

With the south facing slopes finally cleared of snow I was able to get out and assess the current state of plant growth in the barrens.  Since I’ve been following the progress of the container grown rare winter annuals, I was anxious to compare that impressive growth with the condition of the wild grown plants.  The big three species at Blue Jay Barrens are Leavenworthia uniflora, Draba cuneifolia, and Draba reptans.  All three grow in barrens areas typified by bare soil conditions and excessive dryness.  This site is one in which the Drabas seem to dominate.

Bare soil of the barrens is not always evident from a distance.  Plant spikes make an effective barrier and give the illusion of solid vegetation.

It’s not until you are in a position to view the ground from a more aerial perspective that the patches of soil become apparent.  Tufts of grass sit like a thousand islands with channels of soil running between.  The grass plays an essential role in protecting the soil from wind and rain.

In some areas a thin layer of dark soil exists.  The protective grass has not only offered protection, it has provided organic matter to fuel the soil ecosystem.

The typical barrens soil presents a less prosperous appearance.  A gardener faced with soil like this would probably begin looking for a new hobby.  However, for some special plants, this is the ideal home.

The layers of small pebbles associated with many of the barrens are a result of erosion.  Rainfall has broken the soil into its individual particles and the smaller of these have been carried down slope with the runoff water.  Left behind were the small stones and pebbles that form a protective layer over the soil surface.  The energy of the rain is now spent on the stones and the soil is left in place.

Other factors also assist in keeping the barrens soils in place.  Moss and lichens are two plants that tend to bond organic matter into a living mat that is much more rain resistant than the bare soil.

In some of the larger areas, annual grasses provide temporary winter cover.  The dried grass plants shown here are Sporobolus vaginiflorus, a low growing annual that thrives in hot, dry areas.

Other plants grow in the barrens soil, but often suffer from the elements.  This Rose Pink, Sabatia angularis, has lost several of its leaves from exposure to extreme cold temperatures.  The plant is still alive and will recover from this setback.

It only takes a little protection for a Rose Pink to make it through the winter unscathed.

A barrens plant that doesn’t seem bothered by the coldest of temperatures is Gray Goldenrod, Solidago nemoralis.  The perky little basal rosettes wait patiently until longer daylight hours spur them into growth.

I did find a few Draba cuneifolia, but they were much smaller than those grown in my artificial container barrens.  Drabas require full sunlight during their growth period and will quickly flower before the surrounding vegetation grows high enough to produce shade.  I’m sure they will prosper and produce a good supply of seeds for future years. 

Rose Pink in a Drought

The drought has caused shortened growth and aborted flowering attempts in many plants.  Rose Pink is an exception and has flowered on schedule and in greater than average numbers.

Even so, the Rose Pink blooms are short lived and the petals quickly fade as energy is put into seed production.

Rose Pink grows on some of the driest and most barren sites.  Grasses and other prairie flowers would normally obscure the clusters of pink blooms, but this year’s short growth leaves the Rose Pink out in the open.

Even though they are doing well, the Rose Pink plants are showing obvious signs of drought stress.  No matter how well developed the root system, it’s hard to find any moisture in the steep, rocky soil.

Despite the dryness, flower buds remain hydrated and the flowers open normally.  The one odd thing I’ve noticed is the absence of any odor.  Rose Pink flowers are very fragrant.  The scent of several dozen clustered plants can be detected at quite a distance.  I wonder how the absence of fragrance will affect the number of insect visitors aiding in pollination.  A Rose Pink flower releases its pollen prior to the stigma being ready to accept it.  This method increases the chances of pollen from another plant fertilizing the flower.  Self fertilization is possible, but that method is likely to produce fewer seeds. 

Rose Pink is a biennial plant, meaning that its life cycle is completed in two growing seasons.  During the first year, the plant puts down a deep root system and forms a rosette of leaves at the ground’s surface.  In year two it flowers, produces seed and dies.  Unlike perennial plants, the Rose Pink cannot abort flowering and wait for the next season.  If no seeds are produced, there are no plants for coming years.  Every bit of energy in this plant is focused on seed production.  I hope it’s successful.

Rose Pink population size fluctuates widely from year to year.  I’ve watched it survive a wide range of weather conditions and I’m sure this year will be no exception. 

February Prairie Greens

The prairies always look their most desolate in February.  The grasses have weathered several winter storms and have lost most of their bright colors.  Add to that the fact that I’ve been looking at the same brown color for three months and you can understand why I make an annual February search for growing plants hidden beneath the drab grasses.

I have to give credit to some of the grasses for maintaining a remnant of their fiery brightness through the winter.  Elliott’s Beard Grass adds a flash of color to the winter prairie landscape, but I’m looking for some living plant parts.

Hidden within the tall grasses, Blue-green Sedge has fresh green leaves throughout the winter.  Long periods of freezing days with no snow cover sometimes browns the leaf tips, but it’s evident that this species is adding new growth at every opportunity.

Gray Goldenrod also slowly adds growth through the winter.  This is the normal condition for these native plants.  Unlike some cultivated plants that are putting on early growth because of the mild winter, the native plants are responding to other cues and growing according to their natural pattern.  They will survive and prosper no matter what variances in winter weather may occur.

For many native plants, day length is a stimulus that moves them from one stage of growth to another.  Rose-pink basal rosettes remain small but active during the winter.  No matter how warm the February days, the plants won’t enlarge and prepare to flower until the proper time in the spring.  Rose-pink is a biennial that depends on its crop of seeds to insure future generations.  If plants like these couldn’t time their flowering to best advantage, the species would not persist.

Pasture Thistle is another biennial that is regularly active through the cold season.  The number of winter rosettes gives a hint to the number of blooms you’ll see later on.  This plant is a particular favorite of mine.  The bright purple thistle flowers are a lead in to the prairie blooming season.  The thistles sort of set the mood for what’s to come.  Indications today, forecast a very colorful prairie this summer.

Rose Pink

This is Rose Pink, Sabatia angularis, the most fragrant summer bloomer on the prairies of Blue Jay Barrens. When a lot of these plants bloom together, the sweet scent is almost overwhelming.

It looks like the Rose Pinks are going to have a very good year. This plant has just begun to bloom and you can see a mass of buds that will soon make this plant a solid mound of pink.

Here’s a plant that’s a bit farther along, but there are still a lot of blooms yet to come.

Rose Pinks can grow in some of the harshest conditions. The plant is a biennial, taking two years to reach the blooming stage. Two good growing seasons in a row can result in the fields being an almost solid pink. This is a more typical year. The plants are plentiful, but not dominant in the landscape.

The flower typically has five petals, but sometimes you’ll find a bloom with six. This abnormality is normally seen as one or two blooms amongst a plant full of normal flowers.

Most plants show a range of characteristics as part of normal genetic variation. I suppose, if Rose Pink were produced commercially, the plant breeders would work hard to perpetuate this six petal variety.