The bigroot geranium
is easy to sow, and this should take place in the spring and fall of each year. Before sowing, the soil should be loosened and good drainage should be ensured in the planting area or pot. After loosening the soil in the planting area, apply a thin and even layer of base fertilizer, before covering with a thin layer of soil. Then, sprinkle the seeds into it before laying a final thin layer of soil over them.
A warm, humid environment and abrasions on the seeds before sowing can help germination, which will usually take 2 weeks. If it is to be planted for a long time, you may need to keep seedlings under cover after sowing, for planting out in the coming year. Fertilization should be carried out once before flowering, with a compound fertilizer containing phosphorus and potassium being preferred. The seeds will be much more nourished after fertilization.