This tree - "Lemonade" was developed in Australia cross between lemon tree and mandarin tree.
Apparently, the fruit is sweet like mandarins but with lemon-gy tang and can be eaten straight from the tree. Growing requirement for lemonade tree is similar to other citrus tree.
Photo 3 is what's for sale. This is grafted.
Lemonade Tree (Grafted)
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When the plants reach your care, you must care for them immediately. We are not responsible if the plants die under your care.