It is not a good idea to plant any deciuous tree near a pool as the leaves foul the water when they drop.
It is a good idea to use aged manure or compost when planting chrysanthemums.
If erosion of soil is meant, then planting trees in the area is a good idea as the tree roots literally hold the soil together. You need to chose the right kind of tree though ie you wouldn't want to plant a beech tree to close to your house as the roots grow so extensively they can damage the foundation structure of a building
Planting in soil and cotton is not a good idea really. If you are doing a experiment then you cant rush it. If you are just planting a plant try to use soils with plant food inside of them and give it water daily.
Plastic wrap is not a good idea as it causes the tree to sweat. Try a canvas wrap as this allows the tree to breathe.
It would be a good idea in a very high tree. Or more easy a tree with flowers.
That would be a good idea for decorating at Mardi Gras. You could put masks on the tree and beads.
Iris tubers may dry out between planting and digging. It is a good idea to soak them in water before planting. It may also need to have some bleach in the water to kill any iris borers. A ten minute soak with a water bleach mixture of 90/100 will kill the bugs.
because it would be a nature habittat
habitat restoration
That depends on when it starts germinating. After germination it takes less than a week for the plant to rise from the soil. Germinating seeds before planting them is always a good idea.
You may want to remove the tree to make room for something else in your backyard such as a garage or a shed. Also, if the tree is dying or is dead it is a good idea to remove it to make the garden look better and the value of the property higher. Trees can be removed from a backyard for aesthetic reasons. They can also be removed if diseased. If the tree coudl fall and cause damage to say a home or neighboring property, it is a good idea to remove the tree before big storms hit.
If you want a great environment in Animal Crossing, start by planting as many flowers as possible everyday. Plant the flowers everywhere! Also, make sure there is NO weeds, tires or cans anywhere in your town. Planting trees is also a good idea, but not too many.