Purchased a plant with 3 small trees coming out of a 8" pot, should it be repotted? It only stands about 21" tall.
I'm sorry, your photo did not come through. Some trees prefer to be rootbound, and some do not. It would be hard to say without knowing which species of tree that you have.
Generally, three to a small pot is not a good practice, and will not leave you with healthy plants. If it is a tree that tolerates root disturbance, you can split them into their own containers. If it is not, then doing so can kill it.
Here are some articles that will help: https://www.gardeningknowhow.com/houseplants/hpgen/should-you-repot-your-plant-happy-root-bound-house-plants.htm
https://www.gardeningknowhow.com/houseplants/hpgen/prune-roots.htm
https://www.gardeningknowhow.com/plant-problems/environmental/root-bound-symptoms.htm
It should be fine. The fertilizer is continuous release so it shouldn't burn. I use it when I plant bare-root plants in pots and haven't noticed any burning.
https://www.gardeningknowhow.com/garden-how-to/soil-fertilizers/what-is-fertilizer-burn.htm
https://www.gardeningknowhow.com/garden-how-to/propagation/propgen/bare-root-planting.htm
I have a flowering agapanthus, peony, clematis need to be dug up for about 7-10 days while garden is being landscaped. What is the best way to store them for this short time please?
I would put them in separate nursery containers with potting soil, as if you were planting them. Then place them in a semi-shady location, such as under a tree, till it's time to move back. Keep soil moist but not wet.
Best way to transplant.
It's easier on the plant to move them in spring or fall, but you can transplant in summer if you baby them afterward with plenty of water till they get established. Also protect them from sun and wind during the transport. Get as much of the rootball as possible when digging it up. Have the new location ready before you dig up the plant to be moved.
We have just moved to a new house and want to redesign the garden. There are some existing plants that we'd like to keep but they would need moving. Since we can't redisgn all at once can we temporarily move these plants and then move them to a more permanent place later once we decide where they would best go? These plants would include roses and peonies.
You can always transplant into pots to plant in the ground later. I would caution you about the peonies, though. If there is any way to do them first, have the new location ready when you dig them up, they will have a better chance of surviving. Peonies resent being moved and twice might do them in.
https://www.gardeningknowhow.com/ornamental/flowers/peony/moving-established-peonies-2.htm
I have a plant that has been in a plastic bag as a greenhouse for 3 weeks as it is propagated. I removed the cover today and it appears there are new roots and new growth. When and how do I remove it from the plastic bag greenhouse without damaging the plant so it can be transplanted? Is there a process or do you just remove the plastic bag and let it go?
It sounds like it is ready to be transplanted without the plastic.
We recently moved house and I could not bring two favourite roses so took cuttings. These began to grow well so I moved to slightly bigger pots and they are growing lovely. I did this in June when would be a good time to transplant them and any tips how to do it. One is a hybrid tea the other as shrub rose I think. Many thanks
Since your transplants are young, you may want to overwinter them in the garage and plant them in the spring. If you have mild winters, you can plant them now.
https://www.gardeningknowhow.com/ornamental/flowers/roses/planting-rose-bushes-in-the-fall.htm
https://www.gardeningknowhow.com/ornamental/flowers/roses/planting-rose-bushes.htm