'Koshobai' Japanese winterberry (Ilex serrata)
IMPORTED FROM JAPAN
Ilex serrata 'Koshobai' is a self-pollinating dwarf variety (no need for female/male pairing). To say that they are rare anywhere outside of Japan would be an understatement.
These are always grafted on Ilex serrata (cuttings do not work). The graft will fade as you develop and thicken the base of your tree.
Last image is an example (Imported last year and allowed to grow vigorously then cut back).