pistache, redbud or burr oak...??
We have lost our old pecan shade tree to borers & need to plant a replacement for shade in our small back lawn. Need a tree with long tap roots, few invading surface roots, no messy seeds to fall & sprout, not excessive water needy, medium height...35 ft. & relatively pest free ... am I asking for a non-existing tree?!!
I was considering the Burr oak as it grows rather slow (so the eventual height would be after I am gone!) & long tap root, a pistache tree as it is smaller & has pretty red fall leaves & a redbud. I see some redbuds that have very dark purplish/red pretty flowers (& others have lighter pink flowers) but not sure if they are the Canadian or Western redbud variety? Locally the earlier favorite ash trees the city planted have had borer problems (Raywood ash have survived better) & many dying and the Bradford pear have lost limbs to the winds but now the city is planting the burr oak... so am wondering if they will also go the way of the city's earlier choices! Any ideas would really be appreciated! Live in mile high, high desert zone 7 with 8-9 in. rainfall in a good year; irrigation is a must!