preparing garden for fall
Okay, I confess I am a total newbie at in-ground gardening, but I am so happy to have found this forum. I just bought a house in Longmont, CO with a HUGE garden in the back. It is currently completely overrun with weeds and 12 foot tall sunflowers. I am feeling overwhelmed and don't know where to start to prepare the garden for fall. Ideally I'd like to plant a few cold-weather crops like maybe onions and greens. Here are my questions:
1) Can I compost the sunflowers? They are giants and there are a lot of them. I have a tumbling composter and a big heap left behind by the former owner.
2) I'd like the garden to be plantable come spring. Should I mulch or plant a cover crop to keep down weeds?
3) Is there anything I plant in a small sunny corner this time of year that I could harvest this fall?
4) Any other tips for a brand new gardener?