When is the time to prune your snow peas? My plant is 6 feet tall and had lots of blooms last year. Do you need to go just above the soil in September, or can I trim it back now in the spring for this year's harvest.
After harvesting cut the plant's stem at soil level and dig in the roots to boost the soil's nitrogen.
The leaves have white spots on them and also a powder like covering on the lower part of the plant and leaves. The lower leaves are turning brown and drying up. Is it normal, and what can I do about it if the plant is infected?
It sounds like you have powdery mildew. This article will help:
https://www.gardeningknowhow.com/plant-problems/disease/get-the-cure-for-powdery-mildew.htm
How do I know exactly when to harvest the snow pea? They just grew within the last week, but don't know how large they need to be before harvesting? Also, some of the pods have some peas in them, but how big do the peas or pods need to be when picking them? I tasted one raw and tasted a string in it. Do I need to remove a string? I am new at gardening, especially snow peas.
This article might help out: https://www.gardeningknowhow.com/edible/vegetables/peas/how-grow-snow-peas.htm
I made a raised vegetable bed and filled it with bagged topsoil. I think it has too much nitrogen because I have four foot tall snow pea vines and not a single flower. My bush beans are large and leggy, but no beans. Any fixes or do I need to start over? How can I lower the nitrogen level?
The following article should be of some help to you: https://www.gardeningknowhow.com/garden-how-to/soil-fertilizers/understanding-nitrogen-requirements-for-plants.htm
My mangetout has suddenly turned paler in colour and the flowers seem to be sticking to them more. Why is this? Are they just coming to an end or should I feed them?
its because its 2 dry i think water them well at night it may help.
Do snow pea pods grow back on the plant after picking?
Yes, peas with keep on coming. Do remember to fertilize lightly after several pickings to help the plant keep producing bloom and fruit. They will begin to slack off production and "bolt" when the weather gets hot. In most areas you can get both a spring and fall crop of peas.
I had a lot of success with my snow pea plants when I had lots of peas picked back in mid June. The plants rotted after that. My question is, how early can I grow new snow pea plants? Can I start now in late July or should I wait for cooler days?
I would wait until early to mid August before planting them again.