Sunday, July 5, 2020

Not so common plums. Sultan, Peach-plum Hybrid DPRU 377, and Jefferson

Sultan plum was recently revived by few CRFG members.  I grafted this cultivar in 2018.  It produced some fruits the first time this year. These are very good meaty sweet dark plums. Ready in early July. The scions should become more available at the CRFG winter exchanges.

DPRU 377 was noticed by friends and myself during an orchard walk at Wolfskill in 2013. The leaves looked peachy from the distance, but the tree grew in the plum area.  We tasted the fruits and found them very flavorful. There are no records of this accession in the USDA GRIN database. And there was only this single tree in the orchard. The picture of the tag on the tree said that  it is a complex cross: MyroXSpinosa X Domestica

We obtained the scions from the USDA the following winter and grafted them. While the grafts grew well (on the proper rootstocks), the fruiting took years to occur. This year I got only 2 fruits on the tree I made in 2016 on the Citation rootstock.  My graft from 2014 onto the Santa Rosa plum branch is barely surviving. After tasting the first fruit this year I consider this maybe the best "plum" I tasted. Sweet, flavorful and very aromatic. It has unusual flattened shape. The stone is small, like a plum, but it has indentations similar to a peach stone. After searching though GRIN again, I found that accession DPRU 375 was originated from the former USSR in 1939. If the USDA was tagging the accessions in the order received, DPRU 377 could be from the same batch of acquisitions. This gave me a clue that I should be checking Russian web postings of plum-peach hybrids.  The search yielded two videos, both in Russian, that show this fruit and the tree.  Both look identical to what we found at Wolfskill.  My fruit in my picture looks lighter, I suspect it is because my tree grows in part shade and I covered the fruit with a clam shell to make sure it gets into my hands.

Sultan plum (left) and DPRU 377 from July 4, 2020

Russian videos about the peach-plum hybrid that I suspect is identical or very similar to DPRU 377



My Jefferson Gage Plum that ripened at the same time turned out to be mislabeled.  Most likely, it is an Asian plum that was sold as Green Gage Jefferson Strain by the LE Cooke nursery.  I got couple of these trees to use as bases for all other gages I wanted to grow. Few years later, I learned that this tree does not accept grafts of the proper gages. Even if they take for a year or two, they do not grow when grafted onto this plum. The fruit flesh of this plum is extremely, even painfully sweet, and juicy too. However, the skin is very sour. The stone never separates easily.  The tree is fast growing and very productive.

Fake Jefferson Plum harvested on July 4




No comments:

Post a Comment

Not so common plums. Sultan, Peach-plum Hybrid DPRU 377, and Jefferson

Sultan  plum was recently revived by few CRFG members.  I grafted this cultivar in 2018.  It produced some fruits the first time this year...