What does graft compatibility mean?

• A. They require identical watering schedules
• B. The scion and rootstock can unite and grow together
• C. They must be grafted at the same height
• D. They produce identical leaves

Answer: (B)

The key idea is that for a graft to work, the scion and rootstock must be able to fuse and form a continuous vascular connection between them. When the tissues align and callus tissue forms, the cambial layers can join, allowing xylem and phloem to connect so water, minerals, and sugars move freely between root and shoot. This seamless union lets the grafted plant grow as a single organism. If the tissues don’t compatibly fuse, the graft may fail or grow poorly because the vascular connection doesn’t develop properly. So, graft compatibility is about the ability of the scion and rootstock to unite and grow together. It’s not about watering schedules, grafting at the same height, or leaves being identical.