With the onset of the first few days of warm weather, the impulse to get out in the garden and plant can become very strong. However, it is usually best to wait until the weather is warmer to really get started planting. For many novice gardeners knowing when to go ahead and plant can be confusing. To make things more complicated, not everything can be planted at the same time. However, rest assured there are general rules that you can use to know when to plant.