Tree-of-Heaven is an invasive species, but now researchers may have found a way to control it. Researchers at USDA report finding a potential natural enemy for Tree-of-Heaven in France. It’s a mite ...

Is it thumbs up or thumbs down for tree-of-heaven (Ailanthus altissima), now standing out among the general greenery for the mops of yellowish or orangeish seeds capping its stout branches? Thumbs ...

WEED SEEDS: Many summer weeds are setting seeds now. Do not let this happen! Pull these weeds and dispose of them to reduce weed problems next year. In particular, stay on top of gripe weed or ...

Q: I have one pomegranate tree in bad shape. The leaves are turning yellow and then brown; yet underneath the veins are pink. This is one tree out of my 50 that looks like this. The other trees look ...

That’s the benefit of nurturing weed trees — you shouldn’t have to do much, if anything, for them. Watering when it doesn’t rain for a while will help them grow, Katie Gannon, director of Tucson Clean ...