What good trees work near power lines?

I live in Brookside and have a very small lot.Our neighborhood electric lines run through the back of our home. I would like to know what trees might be appropriate to plant to screen our back door from our neighbors door that would not get too high and get tangled in the lines

When should I plant Nepeta?

I saw Dennis' article in The Star's GROW about nepeta. Can I plant it now, even though it's still chilly? Or should I wait? When is the best time to plant perennials? Thank you