They look great and zone 7 hardy! Citrus has came a long way. Here in zone 6 we can grow trifoliate oranges and I have been successfully experimenting with them for 3 years. Here are a couple of zone 6 hardy citrus trees Citrus - Edible Landscaping. Maybe we can make a great looking pie like yours out of them if we get them to take off! What’s your recipe? Citrange are said to survive to 0 degrees Mckenzie-Farms. Our zone was upgraded from 5b to 6a. Anyone interested in cold hardy oranges can see this old post Oranges in Zone 5