I need some help re cross-pollination of Pembina Plum tree - I understand it can cross-pollinate with another Pembina, or another plum tree, or a Sandsomething! However, where I purchased it said it can cross pollinate with a Nanking Cherry bush. So I checked other greenhouses and they said no - however, the people speaking to me were young summer temps! So back to my supplier - they spoke to the boss and she confirmed that it can - she had apparently studied all about Horticulture for 8 years. So I look a leap of faith = since then people have sown seeds of doubt - so I am checking again with the experts!!! thanks in advance.