Seeds are collected from the best culinary selections including 'Double Rainbow'. From seed, these are the best plums to grow as a population which is preferable to cultivar plantings especially with the beach plum. This provides both the genetic diversity for pollination as well as enough seedlings to develop mixed selections that can be rooted easily.
"Double Rainbow" Plum This selection was selected from a batch of seedlings at my farm that were planted on an exposed hillside in a group. The seeds were originally collected in northern Michigan from the variety "Squabnockett" according to the records of the grower who had them. The seedling began fruiting at a young age with heavy crops almost every year. When fully ripe, the sweet fruit can be eaten fresh off the shrub and can also be used for processing. Immune to plum curculio and other fruit worms, the fruit suffers no damage and is always clean at my farm. There are no foliar diseases on the foliage to any extent and no fungal diseases with the fruit. The fruit can be harvested over a long period of time up to 2 months in some years with little degradation. The skin is firm enough that it rarely splits and could possibly lead to commercial production as mechanical harvesting is possible with the durability and dense fruit set. This variety can be used for fresh eating and if harvested earlier when it is more tart it could be made into jam and jelly.
"Double Rainbow" Prunusxmaritima
To Germinate the Seeds: Follow the normal cold dormancy for plums by planting outside in the fall 1/4 inch deep with seeds spaced 1 inch apart. Seeds will emerge in late spring. A portion of the seeds will sprout after another warm and cold period. (Summer and winter).
For indoor planting, put the seeds in lightly moist Canadian Peat moss in a zip lock bag before putting in the fridge for 90-120 days at 34F to 38 F. The seeds will begin germinating in 60 days. Pluck out the cracked ones as the shells split open and plant 1/4 inch deep in lightly moist well drained soil mix. Do not overwater as beach plum seeds rot easily in heavy high organic soils. Some seeds will need an additional warm and cold period to germinate. This is normal for this type of seed so careful not to throw out the seeds thinking they are bad or blanks.
|Genus & Species||Prunus maritima|
|Seed Source||Maine, Michigan, Ecos|
|Hardiness||-25F or more|
|Pollination Requirements||Self fertile but likely needs to two genetically different to set fruit. Any two plants even from the same strain works.|
|Soil||Sandy, sandy loam, slightly acidic|
|Climate||Much more forgiving to humidity than the American plum but does do well in drier sites with sandy soil. Zones 3-8. Not good far south. Not sure about desert conditions.|
|Ease of Cultivation||Easy to grow from seed. A portion of the seeds sprout the second year. Do not think you have failed the first year.|