Cryptomeria japonica 'Knaptonensis'
A beautiful semi dwarf cryptomeria with a very tight, compact growth habit. Takes on a slightly upright, semi-columnar shape with maturity - slightly wider at the base. Foliage is bright lime green with new growth during the spring / early summer being a brilliant white - truly striking. White color fades just a bit with summertime heat, and then re-appears with the onset of slightly cooler temps & conditions in fall.
variety does display some very mild bronzing during cold weather if planted in an unsheltered location in colder hardiness zones. Makes a perfect choice for an unusual planting in semi-shaded locations, and does best when given a little protection from hot, afternoon sun.
Knaptonensis is a very hard Cryptomeria cultivar to locate - not too many folks have material left to produce them.
Plant Facts & Specifications
--Mature Height: 5 - 7 ft
--Mature Width: 2 - 3 ft.
--Growth Rate: Slow to moderate ( 4" - 6" avg per yr )
--Hardiness Zones: 5 - 8 ( if unsure of your zone, please use zone finder below )
--Sun Exposure: Full sun to partial shade - does best in areas where sheltered from hot afternoon summer sun
--Soil Preference: Average to slightly moist & fertile, acidic - well drained. Mulching strongly recommended to add organic matter to soil & moisture retention.
--Foliage Color & Texture: Typical needle like foliage of most Cryptomeria. Good medium green base with new growth being bright snow white....eventually maturing to green. Has a rather thick, almost rubbery texture.
--Flower, Cone, Or Berry Facts: None to mention.
--Diseases / Insects: Two
types of Fungi - Pestalotia sp. and Phyllosticta sp. - have been
occasionally discovered on browned off branches in several areas of the
Southeast. Hard to say for sure if these fungi were the cause of the
browning, or appeared after branch dieback had occurred. No other major
pest / disease problems have been reported.
--Fertilization / Feeding: For maximum health & hardiness, we highly recommend a good grade granular ( preferably organic ) fertilizer / plant food for use with all of our plant species. We personally use, and recommend the Espoma line of organic plant foods, as they are super effective yet gentle enough to use on even the most delicate of evergreen species where fertilizer burn would normally be a major concern. However, a water soluble type plant food (Miracle Gro, or equivalent ) are also acceptable options. Other granular fertilizers with a 6 - 12 - 12, or 10 - 10 - 10 ratio can also be used - but we suggest using them at 1/2 - 3/4 strength to avoid any chemical burn issues to the root system of the plants. Best to fertilize in early spring, and again in mid fall - avoid feeding standard chemical fertilizers during hot summer months, and directly after transplanting. The Espoma Organic Plant Foods may be used at anytime.