Dear Mark_K - I have also been battling this insidious weed for years now. (My husband and I both think it tastes nasty so please don't anyone ask me to eat it.) I am sorry to tell you this but the damage is done. I know from personal experience! When you till purslane, you are breaking the roots into multiple root "starts" and propagating the horrid little plant. Plus, you planted any purslane seeds that were on the flowering plants. :( All you can do now is spend the next SEVERAL YEARS pulling them up very carefully, as I have, before they have a chance to flower. Over time, you will see a reduction in this weed. It takes a lot of patience as the seeds hold up for many years and any time you disturb the soil, you will see them pop up. My condolences on your purslane invasion.
Dear Mark_K - I have also been battling this insidious weed for years now. (My husband and I both think it tastes nasty so please don't anyone ask me to eat it.) I am sorry to tell you this but the damage is done. I know from personal experience! When you till purslane, you are breaking the roots into multiple root "starts" and propagating the horrid little plant. Plus, you planted any purslane seeds that were on the flowering plants. :( All you can do now is spend the next SEVERAL YEARS pulling them up very carefully, as I have, before they have a chance to flower. Over time, you will see a reduction in this weed. It takes a lot of patience as the seeds hold up for many years and any time you disturb the soil, you will see them pop up. My condolences on your purslane invasion.