I stay next to an open park and have a couple of willow trees about 60 metres away from my boundary wall
These articles will help:
https://www.gardeningknowhow.com/edible/fruits/fegen/fruit-trees-in-wet-conditions.htm
https://www.gardeningknowhow.com/ornamental/trees/tgen/wet-soil-trees.htm
There are four sites each surrounded by a patch of bare earth. They are flush with the lawn level after years of mowing.
This is something that I would contact your local agricultural office, or local authorities over. Your laws may be different then ours here in the US.
Here, you can't kill anything else that originates on another's property.
I would love to plant a garden I’m not sure if any vegetables would survive
With a little diligence you can grow quite a large number of crops in the desert! This article will help:
https://www.gardeningknowhow.com/edible/vegetables/vgen/vegetables-in-the-desert.htm
I garden in a community garden which is open, no barriers to the wind. I think this is why the garden can be 10 degrees cooler than the temp. in town. Do you think this is correct, and any ideas for creating protection from frost in this microclimate? Thank you.
Cities are full of black top, pavement, and lack trees and plants to absorb sunlight. This is what contributes to cities being, generally, warmer than surrounding areas.
The best way to avoid frost damage will be to plant the correct plants for your zone, and at the correct times.
You also can plant wind barriers such as hedges, small retaining walls, or small trees.
https://www.gardeningknowhow.com/special/spaces/wind-resistant-plants-for-your-windy-garden.htm
straight with pod down ward.Do they need something to straighten up?
You don't mention what plant you are referring too, but most plants will stand themselves back up.
hed that shades most of the East-south side of the garden in the morning. I'm afraid planting my corn on the north or west side w ill shade smaller plants because of this. So is planting corn on the south- east side better? We're growing some other taller plants as well like beans, and I plan on bringing melons up on a bamboo trellis. We have a small 340sq ft space for our garden. No where else to put it.
No, the sun will remain, either, directly East to West, or slightly favoring the South. During the Winter, this will deepen to where the sun sits, mostly, in the Southern sky moving from East to West.
Even on the North side the taller plants will not be able to shade the smaller plants.
My front garden is in 3 levels grass and its rocks retaiming them. I am killing off the grass to put chips down but the rocks are starting come away so what could i put in place that is cheap and durable before i put chips down? Thanks
Unfortunately, roots are what is holding the whole thing together. Taking all plant life out of the equation will cause the problem to worsen.
Here are a couple of articles that will offer suggestions:
https://www.gardeningknowhow.com/special/slope-hill/plants-that-grow-on-slopes.htm
https://www.gardeningknowhow.com/plant-problems/environmental/plants-for-erosion-control.htm