The note from Larson’s Geraniums is “We recommend soil mixes that DO NOT have water-holding crystals. We do not recommend Miracle Grow Potting Mix, since we have had complaints from customers who used it.” They further add, “Make sure the container you use has adequate drainage holds to allow excess water to drain freely.”
Larson’s also notes that alpine geraniums are “heavy feeders.” They recommend a slow release fertilizer and an additional weekly water-soluble fertilizer. I’ll put them on my orchid plan of weekly during flowering and bi monthly when they are without flowers.
Blooming begins in May (you can see some buds already on my plants) and lasts through October.
To promote growth for Ville de Paris varieties, Larson’s also recommends pinching. From their FAQ: “For the Ville de Paris series, plants would benefit from at least 2 pinches, when the stems are about 8-10″ long and again at 12-14″ long. Remove 1-2″ from the tips to pinch. You can also pinch longer pieces of stems later if the plants look “leggy.””