Pinus × densithunbergii 'Jane Kluis' / Jane Kluis hybrid pine

Pinus × densithunbergii 'Jane Kluis' is a deliberate cross (grex) of Pinus densiflora and Pinus thunbergii. It is a dwarf, globose selection of hybrid pine with straight, rigid, fresh-green needles and prominent white buds. Typical rate of growth in most areas is 2.5 to 6 inches (6 - 15 cm) a year resulting in a shrubby tree 2 to 5 feet (0.7 - 1.5 m) tall and wide after 10 years in the landscape.

A description by Ken Church for the publication, Conifers, The Illustrated Encyclopedia, by D.M.van Gelderen and J.R.P. van Hoey Smith, Timber Press ©1996
A very low growing compact plant, raised by Kluis Nurseries, U.S.A., before 1984. The buds are remarkably white; this may indicate that the plant is a hybrid with P. thunbergii. A very nice novelty. Received an Award of Merit from the Royal Boskoop Horticultural Society.

Rudolph H.W. Kluis, of Rudolph Kluis Nurseries, Marlboro, New Jersey is credited with origination, nomination and introduction of this fine cultivar.

An account provided by Ridge Goodwin details the history of this cultivar. Ridge received one of the initial propagations of 'Jane Kluis'
My memory has it that Rudi performed a deliberate cross back in the early 70's with Pinus densiflora and Pinus thunbergii which yielded seedlings that exhibited a range of characteristics reflective of both parents. From this collection of seedlings (which Rudi called a grex), he selected five or six that had distinct features none of which he named except that of 'Jane Kluis'. 'Jane Kluis' was distinct from the others in that it was broader than tall, had coarser thunbergii foliage and had those distinctive white candles. All the others had the typical densiflora habit with some variation, and yet interestingly, all had that distinctive acid green color typical of 'Jane Kluis.'
Pinus × densithunbergii 'Jane Kluis' a magnificent, well-maintained specimen in a private garden in Petaluma, California (USDA Zone 9, Mediterranean climate).
Photo by Sara Malone
7 Year old specimen Seems to be hardier than P. thunbergii cultivars. This specimen is growing in zone 5 and has never displayed any signs of winter burn.
Photo by Bill Barger
Pinus × densithunbergii 'Jane Kluis' at the Harper Collection of Dwarf & Rare Conifers located at Hidden Lake Gardens in Tipton, MI. Photo taken August of 2005.
Photo by Dax Herbst
35 y/o specimen in the yard of Carole & Dennis Groh, showing new candle growth.
Photo by Dennis Groh
Image showing relative size of 'Jane Kluis' in Groh yard. This specimen is approximately 35 years old
Photo by Dennis Groh