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Greenhouse Planting Tips

By Lishah Smith ; Updated September 21, 2017
Make a greenhouse planting schedule.

Many gardeners use greenhouses to grow starter plants for transferring outdoors. Others like to plant and grow collections of different types of plants. The key when greenhouse planting is to remember the structure is a miniature, artificial environment. Growing plants successfully there depends on tending to their various needs and maintaining the proper environmental conditions.

Schedule Seedlings

One of the functions of a greenhouse is to begin seedlings to later transplant outdoors. Scheduling when to start seedlings is crucial to growing hardy plants that will be strong enough to withstand the change in climate and soil. Avoid allowing plants to become root-bound while waiting for the outdoor weather to change. Learn germination rates and growing time requirements to make certain seedlings are scheduled properly.

Temperature Control

Plants in the greenhouse environment benefit from carefully regulated temperatures. These artificial climates should simulate ideal temperatures for the plants growing in that setting. According to Shelter Systems, it is better to err on the side of having a greenhouse that is slightly cooler than it should be. In a mere hour, plants can wilt or even die from an overheated greenhouse.


Don’t overlook the importance of soil quality for greenhouse planting. Prepare soil ahead of time and adjust it to meet the requirements for the various types of vegetation. For example, fast-growing vegetables or annual flowers need higher levels of nutrients than slow-growing cacti or bonsai trees.


Watering seedlings and other greenhouse plants can be a delicate task. It is important to have enough water for growth but not cause plant damage. Growers should only water seedlings enough to keep them moist but not saturated. According to Shelter Systems, it is important to establish a daily routine for working in the greenhouse, when gardeners can examine plants and tend to their watering requirements.

Air Flow

Air flow is vital for planting and growing. Outside the greenhouse, plants have a continual air circulation for photosynthesis and growth. Sealing a greenhouse to prevent air flow will kill seedlings, stunt plant growth and potentially build up dangerous greenhouse gases. Shelter Systems recommends propping the door open while working in the greenhouse and performing daily routine checks. Never seal the door shut or prevent air circulation.