The listing, Greek basil tree seeds has ended.
this variety basil is
Savour™ looks like a little tree—a tasty topiary that is green and bountiful all year long. Unlike ordinary basils, Savour never stops flourishing, so you can grow it in the garden or on the patio in the summer, and move it inside to the windowsill in winter.
A Greek-type, gourmet basil, Savour's hardiness and unique shape are due to grafting great culinary basil onto the root system of a wild variety. Rich and robust, Savour will fill your kitchen with mouth-watering smells and your dishes with abundant flavor.
i got the seeds from my own tree in my urban balcony garden.. the tree bloomed with white flowers and shed of seeds that fell on the soil and grew again. so i would believe this is not a hard herb to propagate