Just wondering, is there a reason why serbian spruce is never recommended as understock for grafting spruce onto? I've always heard that either P. abies or P. pungens should be used.
Picea omorika is a fine understock for grafting spruces, it's less common used then Picea abies or Picea pungens understock.
However I would use Picea pungens at the last place...
coniferjoy, I am curious why you would use Picea pungens as last option?
Coniflora, this is because they contain more resin then the other 2 which will make the grafting work more difficult.
P. pungens needles are much more pricly which also will make the choice very easy...
I guess it isn't used mostly because Picea omorika seedlings are too valuable as Picea omorika seedlings ;-)
Compare their prices with Picea abies seedlings of the same size, you'll see what I mean!
I use pungens - it's our state tree!