The safest starting medium consists only of purchased, sterile ingredients, such as a mixture of 1/2 peat moss and 1/2 vermiculite or perlite to which a small amount of ground limestone is added (for example, 2 quarts of peat, 2 quarts of vermiculite, ...
Soilless seed starting medium - A soilless seed starting medium will insuer that the seeds and seedlings are not killed by too much salt (or salinity) which is frequently found in soil or even regular soilless mixes.
Slip the seed flat into a clear plastic bag to keep the starting medium evenly moist, then place the flat in a warm, sunny spot. If possible, provide gentle bottom heat. Geranium seeds germinate best at 70 to 75 degrees.
Sprinkle them over moist seed-starting medium and barely cover the seeds. Keep the soil moist and at room temperature until the seedlings have several sets of mature leaves.
Use a good-quality starting medium and sow two or three seeds per cell pack. Keep the soil moist but not soggy during germination.
You can start seeds in almost any kind of container that will hold 1 to 2 inches of starting medium and won’t become easily waterlogged.
Where purchased, it should be free of clay, loam or other particles. If using it for potting or starting medium, you may want to rinse it, using a piece of fine screen to remove any sediment or other particles.
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2. Remove the lower leaves on the stem, dip the cut end in rooting hormone powder, and plant it deeply in a pot containing a soilless seed-starting medium mixed with moistened vermiculite or perlite.
 See also: Plant, Medium, Gardening, Transplant, Peat
  
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