Beastly Bindweed

If you were ever skeptical of stories that report that bindweed can come up from beneath asphalt, now is the time to lower your cynicism and face the triumphant floral villain.  A few weeks back, the gravel road in front of our house was paved and it is now full of green-bubbling volcanoes of exuberant triangular leaves.  Although my neighbor questioned the policy prior to paving, the paving company and township said that pre-treating the road base with herbicide was not necessary.  They were wrong.  That root system can go down to over 10 feet deep and if the entire root isn't removed, it regenerates from any remaining rhizomes. To top it off, seeds remain viable for up to 50 years in the soil!  Because of the lack of foresight and the tight pockets of the local government, we may now be in for a lifetime of erupting asphalt on our road.  


Bindweed, or Convolvulus arvensis, which is the likely species in this area, grows throughout Kansas, but was native to Eurasia, carried across the Atlantic ocean and west across the prairies by its own version of manifest destiny. Once cultivated as an ornamental and a medicinal herb, it is now a noxious weed in many states and is nearly impossible to eradicate without toxic chemicals.  The plant at the bottom right has been sprayed twice with Roundup and still continues to grow.  We should consider adding nuclear waste to the next spray.  Or we'll have to try flamethrowers or perhaps raw sulfuric acid.  And what do we do about the yet-unerupted masses hiding below the surface like the one to the left?  How do I kill the seedlings before they destroy the road?

Up till now, I've controlled its spread into our yard, and I've fought it in only one of my garden beds (one with imported soil), but it seems to really like the poor clay base of our road.  Or at least the seeds are feeling cramped and trying to find some sunshine.  The patience and strength of those tiny tendrils is mind boggling.

 

I wish my roses had that excess of vigor.  Or perhaps I don't, because roses that came up through asphalt AND had thorns would be pretty rough on our tires.  Anyway, what's next to test my tolerance?  Kudzu?

Finicky Weeds

Have you ever noticed that certain weeds are specific to certain beds in your garden?  I just became aware this year that I've got several bed-specific weeds; weed species that appear only in one bed in my garden and nowhere else. 

Take for example my oldest rose bed, a raised berm containing a number of old garden and shrub roses.  This bed seems infested with bindweed, but yet bindweed appears nowhere else in my garden.  If I don't watch the bed closely for two or three weeks, the next thing I know, a rose is being overtaken by the twining stems pictured at the right.  I don't believe it's a coincidence that I imported this soil into my back yard while we were building the house and I thus suspect the bindweed seeds came with it, but how do I get rid of it now?  Ten years of diligent cutting of the vines before they could set seed have not decreased the sneaky little ones that start in the periphery of a rose and stay invisible until they hit the sun at the top and spread. And you learn the funniest bits of information by doing research.  I hadn't noticed that bindweed winds anti-clockwise until I read about it.   Another bit of quick research tells me that seeds were still over 50% viable at 39 years.  So maybe 50 years of pulling bindweed to go?

Another bed, again with imported soil, had an interesting vine spring up at one end of the bed that I first thought from appearance was going to be a melon of some sort.  I let it grow that first year, turning nervous only when it began leaping from shrub to shrub and threatened to cover the entire bed.  Finally, when it didn't produce any fruit from all its small white flowers, I chopped it down and have resolved to wipe it out of that bed as well.  It also is still coming up annually, just in that one area.  If it was the soil in the bed, why isn't it appearing in the rest of the bed?

I have Virginia Creeper that only appears on the front left of the house, Black-eyed Susans that only appear in my back rose bed, and a curious little nightshade-like weed that has a habit of appearing only in north foundation bed of the house.  I'm betting the presence of the latter weed has something to do with the shade that is present there and nowhere else in my landscape.  I will always encourage the Black-eyed Susans wherever they pop up, but I'd really like to see the rest of these creatures kick their habits.