Geraniums will grow in almost any type of soil if well-aerated and porous. This means that heavy clay soils should be improved by adding organic matter each year. An inch of coarse sphagnum peat moss, partially-rotted manure, or compost spaded in when preparing the beds is ideal. Garden centers, greenhouses and retail outlets sell plants in the spring. These plants may or may not be in flower.
Plants are generally available as rooted cuttings or as seedlings in plastic trays or pots.
These are sure to grow because all you do is remove the container without disturbing the soil around the plant. Plants should be set in the soil no deeper than the depth they were growing in the pot. If possible, plant more shallow. If you plant too deeply, stem rot will usually kill the plant. Once planted, firm the soil around the roots.