I can't find how far back (how many inches from the ground) I should cut back tulips and daffodils.
Generally, these plants are not cut down. In fact, their foliage should be kept as is because the plant requires it for energy when producing new bulbs.
I have moved into a condo and don't have a garden. I am growing herbs and green beans in pots in front of a window. I was thinking of planting daffodils in the bean pots in the autumn, bringing them outdoors until January when there will be hard frosts, then bringing them indoors. Can I keep them in a basement until growth appears and then bring them upstairs into the sun where it will be at least 70 degrees? Can I plant beans again in the same pots after the daffodil foliage dies back?
I don't see why not. Anything is worth a try and sometimes experimenting is the only way to know for sure. I think about the only thing that may be an issue with this is the watering of your beans, which could result in too much moisture for the dormant bulbs, resulting in rot. But again, you won't know for certain until you try.
Can daffodils be planted in ground cover beds, such as euonymus or vinca, with any success?
As long as the area is suitable to their growing needs, I do not see why not. This article will help with growing daffodils: https://www.gardeningknowhow.com/ornamental/bulbs/daffodil/daffodil-planting-care-tips-how-to-plant-daffodils-in-your-garden.htm
I am planning to plant daffodil bulbs to repel the moles in my lawn, but I am wondering if there is a best time to plant. I want the moles to go back to the wooded area which borders my lawn, but if I plant the bulbs along that border, will the moles stay in my lawn? Do moles winter in the wooded areas or just stay in the lawn all winter? I do not want a line of daffodils in the middle of my lawn, but if that is the best way to turn the moles around, I guess that is what I will do. Any suggestions you have will be considered.
Here is an article or two that you may find helpful: https://www.gardeningknowhow.com/ornamental/bulbs/daffodil/daffodil-planting-care-tips-how-to-plant-daffodils-in-your-garden.htm
https://www.gardeningknowhow.com/plant-problems/pests/mole-control-home-remedies-for-removing-moles-from-your-yard.htm
I purchased pre-chilled Narcissius bulbs and put them in a cool, dark place, as they began to show green leaves from a sunny window. The base of the leaves are turning black and toppling over. Can they be saved?
To store bulbs that have sprouted, this article will help: https://www.gardeningknowhow.com/ornamental/bulbs/bgen/how-to-store-bulbs-that-have-sprouted.htm
Info on when and how to plant daffodils in middle Tennessee.
If it gets cold enough where you live to chill them in the ground, you can plant them now. But if it does not get cold enough for them to get the chill time they need to flower, you will need to pre-chill them and plant them after they are pre-chilled. Pre-chilling is simple. You just need to put them in a cool place for 12 weeks. A vegetable bin in a fridge or an unheated garage works well, just as long as temps stay below 45 F and the bulbs are not allowed to freeze solid. This article will help with planting them: https://www.gardeningknowhow.com/ornamental/bulbs/daffodil/daffodil-planting-care-tips-how-to-plant-daffodils-in-your-garden.htm
I was unable to keep up with planting the quantity of bulbs I purchased last fall. How would I store the excess bulbs through the summer to help them survive for fall planting?
I would go ahead and plant them. It won't hurt them to plant now. They will grow, they just won't bloom (as they have not been chilled) and you don't need to worry about it in the fall.Then the following year they will be fine. This is the best way, as the plants will still be able to replenish their stores to survive the winter.
If you store them for the summer, the bulbs will be forced to deplete their already low stores while in storage and they will have a far less chance of surviving next winter.