will a nectarine pollinate with santa rosa plum
Will it pollinate with a gauge plum or any other plum?
Yes, nectarines and plums are both members of the Prunus genus, and as such can be interbred to produce new fruits. If they are growing near each other, they could possibly pollinate each other, although the fruits of the trees would be the nectarine or plum that you were expecting. However, you could plant the seed of such a cross, and a new fruit might appear. It it were any good it would be sheer luck, though, because developing new strains of fruit, such as the pluots which are appearing in stores now, takes much skill and time.