Also, plants can often be planted closer together in the early days than their ultimate size would imply , when they start to get crowded, then lift them and move them. Just make sure you keep the root ball as big as possible and do it in the winter when they are dormant. The key is to learn to look at life from the plants point of view. This is what powers them. If they don't get enough, they don't grow well or quickly, they flower less, fruit less and are more susceptible to disease.
Water is vital in the correct quantities .
Plants get through water like we do. Fortunately the soil that they are growing in acts as a reservoir for water so they don't need regular cups of tea. However filling the reservoir three times just makes it overflow and doesn't compensate for weeks with no water. If they stand in water for too long, they get trench foot - some are more sensitive than others. Plants compete with each other for light, water and nutrients .