Oh, the city environment's not so bad. There are stresses, of course. For trees planted between the sidewalk and the street definitely there are limitations. I think the main limit is on softwood trees (willows, cottonwoods, etc.) with limbs that are likely to break off and drop on cars or pedestrians. And trees that need the company of other trees, undergrowth, etc. are not going to do well along the street.
Originally Posted by enjambres
For anyone interested, here's Philadelphia's actual list of "PPR Approved Street Trees" (pdf, 442k) linked from the Tree Philly FAQ page.
Thanks for that title. I'll get hold of it. I had out Urban trees : a guide for selection, maintenance, and master planning, by Leonard E. Phillips, Jr. It's a little out of date (1993) but it's rooted in decades of hands-on experience with street trees — choosing, planting, maintaining, and managing the planting and maintenance, etc.
Michael Dirr's Manual of Woody Landscape Plants
... very readable ... very funny ... info on flowering, height, cultural demands, usefulness in parks, streets, etc. ...
So, here's the test of my original question. Can you check and see if Garden Plants for Honeybees mentions the wind? I can't count how many web sites I looked at for lists of bee-friendly plants and trees, without seeing mention of the wind. How amazing it was to realize, finally, that there's an invisible common factor that determines which plants would be listed.
Wicwas press: Garden Plants for Honeybees
by Peter Lindtner. It covers trees, too.
If Lindtner's book mentions the wind, is it in a general "let's orient ourselves with the basic considerations" way, or is it in a breezy, incidental way? (Sorry, can't resist. ) This would be incidental: "Maples, which are basically wind-pollinated, provide a good early source for colonies when they first build up in the spring." Does it even say anything like that, specifically for maples?
Ah ha! Now we're moving into the territory I'm curious about. Yay! From the blurb for The Flower and the Bee:
Wicwas also has a new book out (which I have not seen, yet) called The Flower and the Bee
, by John Lovell...
The book presents the function of bees, beetles, flies and the wind in the pollination of flowers, which have evolved in accordance with their ability to attract and secure the largest number of pollen-bearing insects. The book is the first popular exposition for amateur gardeners, bee-keepers, and flower-lovers of the very far-reaching subject of pollination in general.
Yay! other species of insects, and yay, finally! the wind. Thank you.
It's nice to have folks here who know enough and are willing to answer honest questions. The hard part I've found is getting the questions right. Thanks for helping with that. There's more room on the general topic. And here in the 'Garden/Planting for Bees' corner of Beesource we can go on about individual species as well. One part of the topic that I'm finally catching on about is the qualities of pollen coming from the trees (and other plants) that don't really need flying insects for pollination. And a scrap of a question relates to which of those trees and plants offer nectar at all, EFNs or other sweetness. And why?