Over the past 20+ years, the RPM (Root Production Method)® process has had impressive results in accelerating the growth rate and improving survival of many species of trees. This process is owned by Forrest Keeling Nursery of Elsberry Missouri, and is licensed to EarthMark International. Most trees have produced 3 to 5 feet of growth in the first growing season. In addition acorns have been produced three percent of the time within the first year and one hundred percent of the time within the third year. An open-grown oak tree typically produces acorns when it is 20 to 30 years old. This is an all-natural process, which, without chemical enhancements or genetic alterations, increases overall hardiness and accelerates the growth of processed trees.
The core of an RPM (Root Production Method)® tree's success is in its roots. These trees are grown in successively larger pots until ready for sale and planting on site. Bare root seedlings are typically planted in the ground at a nursery and allowed to grow for 1 to 3 seasons before being dug up and potted for sale. Digging up the bare root seedling cuts or tears the roots causing a period of transplant shock, which RPM (Root Production Method)® trees do not experience. The RPM (Root Production Method)® process also causes massive production of feeder roots, which allow the tree to "believe" that it is 15 to 20 years old after one growing season. This accelerates the tree's growth, causes early nut/fruit production, gives the tree a more solid foundation once planted and provides a greatly increased ability to obtain oxygen, water and food during harsh conditions (flood or drought) during the trees early stages.
Bare root seedling (left) at approximately 715 days.
RPM (Root Production Method)® tree and root system ready for planting (right) at approximately 210 days.
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