Key Takeaways Tender geraniums won't survive winter in growing zones 9 and below without protection.They can be overwintered ...

By doing this simple task, you'll encourage stronger, healthier geranium growth. And with some added help, you'll increase the quantity of roots, too.

Although geraniums are generally grown as annuals because they aren't frost-tolerant, you can overwinter them indoors using a very simple technique.