In compatible root stock. My Meiwa was grafted to incompatible Kuharske Citrange so I planted a flying dragon 1 inch away and did an approach graft and cut out the Kuharske.
Meiwa is the best by far. It can be picked while still half ripe an have a sweet peel with a somewhat sour flesh. You can leave it on the tree until orange for a sweet interior. The Nagami, Fukushu, Nippon, and Indio need to stay on the plant till fully ripe to have a goo tasting peel.
After dozens of tries I have been unable to do any graft of Meiwa kumquat. If my record keeping is correct I have finally got a Meiwa/ FD graft to take. I have a couple of FD seedlings I plan to plant next to my in ground Meiwa trees to do rootstock transplants with them. I have 2 of my 4 seed grown in ground Meiwa trees die quickly.
The bigger tree is a Fukushu kumquat. Only the small one is a grafted Meiwa on FD. I have 2 other seed grown Meiwa trees. I got a quart of fruit from my 1 seedling Meiwa.
I skinned the bark off the 2 trees touching surface and wrapped them together. It took 1.5 years for the graft to seal. I then cut the bark of the Kuharske below the graft and waited a 1/2 year before removing the trunk of the Kuharske. It was the easiest graft to make.
It is a PT. I am growing the 2 PT trees to do an approach graft to my 2, 8 year old, seedling Meiwa kumquat trees. I photographed the correct seedling but I was thinking Meiwa kumquats when I wrote this post. That seedling PT is growing about 4 times faster than my seedling Meiwa seedlings grew. This were the Meiwa seedlings that was meant to be in the original picture.