With their vivid blooms and easy-going nature, geraniums are a popular choice for beginner and experienced gardeners alike. They brighten up the garden and are relatively straightforward to care for.

Q: I attached a picture of a planter containing old-fashioned red rose, apple blossom and tulip geranium plants that are really large. They’re 2-year-old plants that I grew from cuttings. Can I cut ...