Final answer:
Plants require spacing based on their mature height for optimal growth and appearance.
Explanation:
Plants need to be spaced apart according to their mature height for optimal growth and appearance. For example, if the plants are 4 feet tall, they should be spaced 4 feet apart. When creating a hedge or screen, plants should be spaced one-half their height apart, e.g., 2 feet apart for 4-foot tall grasses. In the case of the 1 foot by 1 foot trees that need to be 3 feet apart, they would indeed have enough space as they are meeting the recommended spacing guidelines.
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