My local garden supply outlet made me aware that some weeds will not be destroyed at 140°.

Thank you so much. I really needed this info. I've found such unreliable info on this in the past.

So much of killing weeds, composting and just keeping a great yard depends upon where you live. If in the South you can kill a weed in a day. The moister and cooler areas need the 3 day plan. Just make sure you get the entire root wherever you live.

Good information on composting weeds. I tend to throw weeds in our garbage can.

I like the solarizing idea a lot. To this point I've just been using the "pile it on and forget about it" approach. Would solarizing also kill any diseases (bacterial, fungal) that might be on the weeds, too?