Here is a simple answer: Seed geraniums are a compact version of the zonal geranium growing less that one foot with smaller, more numerous flowers. 4. Zonal geraniums have 4-6 inch global flower heads that need to be deadheaded by removing the entire flower stalk down to where it meets the main stem.
I always wanted to know this too! Just in time for me to start visiting the local nurseries!
Hi Terry, here's what I found in a google search. Hope this answersyour question.
Zonal geraniums are propagated by cuttings while seed geraniums are through seeds. Zonal geraniums are genetically advanced plants, propagated with the goal of producing sturdy, stronger zoned leaves and shatter-resistant flowers
The seed grown varieties are usually smaller and have more flowers than those propagated by cuttings. They also tend to have more disease resistance and heat tolerance. ... From seed to flower can take up to 16 weeks.
By regular Geranium, do you mean Hardy Geranium you leave in the garden all year long. They can be divided to propagate! The other type of Geranium is the annual Bedding Geranium, mind you you can keep them if you have a dry place for them to over winter in. They can also continue flowering all year if you bring them in to the house in a pot. They can be propagated by braking off a stem and setting it in dryish sandy soil mix until rooted. Best wishes.