When a 90-foot Christmas tree at Fashion Island lights up for the first time Friday night, it will mark just one mega-tree in a series sparkling to life for the holidays in shopping centers throughout ...

What limits the height of trees? Is it the fraction of their photosynthetic energy they devote to productive new leaves? Or is it their ability to hoist water hundreds of feet into the air, supplying ...

Q: About a third of our homeowners have palm trees which were planted several years ago. These palms are now over the allowable roofline height for trees. We know they cannot be topped without killing ...