Tuesday, April 1, 2014
Q. The landscape people are into variable drip emitters and think I am a little looney sticking to drip emitters. How do you determine how many gallons to give large trees like African sumac, bottle trees, Swan Hill olives, Yew pines and chaste trees?
Q. I have this Yucca for about 15 years and I am getting concerned about all the growth on the arm that you can see from enclosed photo. It is getting real heavy and I don't want it to snap. Any suggestions?
Q. I’m replacing some red yuccas that have grown too large for a three foot area, unprotected in full sun. They spill over into the walkway where my grandchildren have been getting stabbed by the leaves. Can tree roses handle that kind of weather?
Q. I planted a five-gallon pear tree about three springs ago and it seems pretty happy espaliered along my west-facing block wall, but a few new leaves on three of the branches have some kind of black rot on them. It has rotted away part of the leaf on some of them. Can you tell me what this disease is and whether and how to fight it?
No significant weather events occurred during March except some temperatures below 45F which could account for some chilling injury to sensitive plants. See the report below.