Grafting on itself.

Grafting on itself.

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2nd solution => grafting.

You need a stock plant which sends the exact amount of sap required by the scion.
Opposite, after a few years, you can see that the stock shows less vigor than the R. arboreum grafted onto it.
So you need a large collection of stock plants with different vigor.
For example a stock for the macabeanum KW 7724 should not have the same strength as for the cerasinum KW 11011.
Another problem has arisen which we rarely speak about : the stock has to send the sap according to the growth season of the scion variety.
For example, do not use an early blooming rhododendron stock plant to graft a late blooming one..