Bulbs need to be planted two to three times as deep as the greatest diameter of the bulb. Tender bulbs, such as dahlias or gladioli, have very different requirements. They need to be stored in a protected, cool, and dry location. Dig them up, shake off excess soil, and store in paper bags filled with sawdust or shredded paper. Do not let these bulbs freeze.
Annuals live for one gardening season and then die.
So, in the fall these need to be removed. One exception is sunflowers that can be left for birds to enjoy. After pulling up the plants that have died, compost them. Do not add any diseased plant parts to the compost pile. Perennials are plants that grow back year after year, assuming they have proper conditions and care.