Answer: It sounds like quite a problem. You might contact your local Cooperative Extension office (ph# 619-694-2845) to see if they can help you identify the culprit, and see if perhaps they have some speciall tricks to combat it. <br><br>Here are a few thoughts: One trick I use is to lay down a thick layer of newspapers (or corrugated cardboard) first, then top with mulch. And I mean thick--not just a few sheets but a layer 1/2-1 inch thick. <br><br>Another option might be soil solarization. This will put the bed out of commission for one summer, may not solve the problem if indeed the plant has tenacious rhizomes, and will kill lots of good soil organisms, but you might give it a try. To solarize soil, first turn the soil over with a garden fork or spade, thensmooth the surface. Water the site until it is soggy. The next day, cover the area with clear plastic--3- to 6-mil is best--and bury the edges so it won't blow away. Seal it well so no fresh air can get under the plastic--you want it to get good and hot. You'll be effectively cooking--steaming!--the weeds. Then simply leave the area covered through the hottest part of the summer--at least July and August. (Soil solarization works best in warm climates.) <br><br>Finally, you might try one of the new organic pre-emergent herbicides. WeedzSTOP is a corn gluten-based herbicide that inhibits seed germination of tough weeds. Note that you would not be able to plant seeds in areas treated with this herbicide, but it won't affect transplants or bulbs. (WeedzSTOP is available from Gardener's Supply, ph# 800-863-1700, web site: [url=www.gardeners.com)<br><br>Maybe]www.gardeners.com)<br><br>Maybe[/url] a combination of these tactics will work for you. I hope so!
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