More detail than some will appreciate, but also a clue on how to find sulfur at a good price. The article fruitnut has linked to clearly states that sulfur can be deficient in fields used to grow alfalfa, and that improved yield will be had when sulfur is applied. Several years ago, when I was trying to find an economic source of sulfur, to lower soil pH around our blueberry shrubs, I was obliged to do some rather extensive research. I learned that farmers in northeast Iowa were seeing problems with corn and soybeans that they could not address with conventional fertilizer. Analysis of the crop was done, and a sulfur deficiency was found. This was around 1975. Since then, agricultural sulfur has become more widely available here in the midwest, where it is often applied to fields used for growing alfalfa, corn, and soybeans. This is NOT being done to lower soil pH-rather, sulfur is applied because the plants need sulfur, as a nutrient. Why is this important to those of us who grow blueberries? Its important, because farmers are buying sulfur in large quantities, and that helps keep the price low.

Annie's annuals carries some varieties that almost disappeared from the trade. They are perennials zone 4 or 5 plus. Annie's Annuals gets great reviews. mt

trees do NOT... can NOT.. invade modern chemically welded PVC pipes ... they can very easily do so .. in old fashioned sewer lines.. like at the link if yours were dug out... as you state.. i cant believe they do not modernize the pipe system ... perhaps you should be asking that contractor his opinion??? a very simple primer on tree roots... some say.. a root mass can be 2 or 3 times the size.. of what you see above ... but do NOT confuse yourself into thinking is is in the same shape ... most are pancake flat.. and only a few feet down in the soil [unless there is a leaking fertilizer source down there.. like a sewer pipe] .. see pic below on the root mass of a silver maple .. unless i forget .. lol .. almost all of its roots are there... in the space my ball cap took ... and the large ones going deep ... were headed towards a septic field... go figure on that ... i dont know either of your trees.. but had green and white ash.. both tended toward surface roots ... which was a big problem for me .... i wnated them deeper ... ken Here is a link that might be useful: link

I'd say my 6" caliper Celebration Maples were about 10' wide. So I'd say that 25-30' crown estimate is a 30 year width. The grow about 18" in height a year though. There may be rules for your municipality but generally speaking I plant trees that width about 7' off the lotline. 3' for mowing and 4' for mulch. I also consider the placement. Is it just grassy area that the neighbor doesn't utilize or an area where kids are active playing football? The latter may prompt me to go further off the lotline. If the former I think you can go 7' off the lotline. Depending on your Arb you might need more than 12' from centerline of each plant.