The vine is very vigorous, and good results depend on keeping it in check. In the Douro it is grown in searing heat in steep schisty vineyards that are more rock than soil. The alternative name of Mortua pays tribute to these harsh conditions. It is usually trained under one of the Guyot systems, and needs severe pruning to keep it under control. In contrast, the vine produces just a few bunches of blue-black Grapes-p1.html" style="text-decoration:underline;font-weight:bold;" target='_blank'>Grapes which vary in size from 'small' to 'tiny'. Thus yields are among the lowest of any commercial grape variety.
In recent years, scientists have been working on cloning the Touriga Nacional to produce vines that are able to pollinate better with the goal of increasing yields by 15% and sugar content by 10%. The most successful clone produced so far has been the R110 clone.[3] |
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