Gardening & Landscaping Asked by Shog9 on November 19, 2021
After three years of pulling, hoeing, and tilling, one corner of my garden is still infested with this vile weed. I live in Southeast Colorado, and the brutally-hot summer days seem to keep it under control except for this one, shaded corner…
Is there anything I can do to discourage its growth (short of paving this section of my garden over)? Or am I doomed to spend my days pulling these quick-growing little beasts…
Have you tried covering the area with clear plastic when your wrea is getting some sun or when it is hot. I would try 2 weeks for a starter.
Answered by Terry on November 19, 2021
Do not let them go to seed!
Common ragweed plants allowed to grow for the entire growing season can produce 32,000 to 62,000 seeds per plant.
But if you don't have time for all that hoeing, consider that you may want to be lazy later in the season:
Plants that emerge mid-April through May can produce up to three times the seeds and biomass as plants that germinate in mid- to late June.
And it might actually be helpful to stop tilling. Ragweed seeds can survive a long time in the soil (one source said 80 years (sorry, I forget where I read this), others say 20-30, even up to 40 years). According to the Purdue sheet above, the deeper seeds won't germinate without tillage bringing them to the surface. Unfortunately that reference doesn't help you with control strategies in your home garden much.
They are hard to kill, too. You can break off the stem and it will regenerate. This means mowing won't kill it, unless you're mowing frequently enough to starve the roots. If you're hoeing, make sure you chop it at or below soil level; even here it seems like there's a chance that an established plant can regrow. Pulling them up by the roots seems effective, especially if you keep up on it and get them while they're small. And if your garden soil is fairly loose, it's not too hard to yank them out.
Seeds can be dispersed by wind spreading them along the soil surface. This means that if you have uncontrolled ragweed in another part of your yard, have neighbors with uncontrolled ragweed, nearby fields, or if your town doesn't keep the roadside ditches mowed, then you'll end up with more seed in your garden year after year.
The strategy I would recommend is to reduce the ragweed seed bank:
Unfortunately this strategy can take a few years to really pay off, and if you let it get out of control for one year, you have to go back to stage 0. On the bright side, this is a good general weed-control strategy, so you will reduce the pressure from other weeds at the same time.
Answered by bstpierre on November 19, 2021
If it's a shaded part of the garden, you could grow something that likes part shade and grows pretty big, like turnips, kohlrabi, kale, brussels sprouts, cauliflower or broccoli and mulch the pants off of that section.
Answered by Peter Turner on November 19, 2021
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