The Juniper Bonsai also known as Juniperus is one of the most popular Bonsai trees. Junipers can be found in all shape and sizes around throughout the world of Bonsai. Juniper Bonsai trees sold at large stores, including Walmart and Home Depot, are often Japanese Garden Junipers, also called Green Mound Junipers (Juniperus procumbens nana). Other popular species are the Chinese juniper (Juniperus chinensis), the Japanese Shimpaku (Juniperus sargentii), the Japanese needle juniper (Juniperus rigida), two central European species: the savin (Juniperus sabina) and the common juniper (Juniperus communis), and three American species: the California Juniper (Juniperus californica), the Rocky mountain Juniper (Juniperus scopulorum) and the Sierra Juniper (Juniperus occidentalis). The foliage colors range from dark blue-greens to light greens and the foliage can either be scale-like or needle-like. Scale junipers usually have needle-like foliage when they are young (called juvenile foliage), the typical scale-like foliage appears later. After heavy pruning or bending, overwatering or other stress often juvenile foliage will grow again. It can last a few years until enough normal scale-like foliage has grown and all the needle-like foliage can be removed.
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Junipers are very suitable for creating deadwood (jin and shari). This is due to the fact that live veins below a broken or for other reasons dying branch will dry out and die. This results in natural deadwood which is peeled, polished and bleached by climatic conditions and is very durable in case of the juniper. The triad of green foliage, reddish-brown or yellowish-brown bark and silvery white deadwood is very appealing.
Position: Place the tree outside, year-round, on a bright spot with lots of sunlight. The Juniper cannot live indoors. During the winter protect the tree once temperatures drop below -10 degrees C (14F). Some species change their foliage color during frosty periods to a purplish brown which is connected with their frost protection mechanism. In spring they will turn green again.
Watering: Be careful not to water too much, as the juniper roots don't like soil wetness. Before you water, the soil should dry well. Misting the tree can be done regularly, especially after the tree has been repotted because it benefits from air humidity. Continue reading about watering Bonsai trees.
Feeding: Use normal organic fertilizer pellets or balls every month during the growth season or a liquid fertilizer each week. If strong growth is desired some higher nitrogen levels can be applied in spring.
Pruning: To develop the foliage pads, long shoots which stick out of the silhouette can be pinched or cut at the base with sharp scissors throughout the growth season. Do not trim the juniper like a hedge because the removal of all growing tips will weaken the tree and the cut will turn the needles brown. When the foliage pads become too dense they must be thinned out with sharp scissors at the base. The Juniper Bonsai is generally a strong tree that also withstands aggressive pruning quite well. But it cannot bud again from bare tree parts, so take care that there is some foliage left on every branch you want to keep alive. Continue reading about pruning Bonsai trees.
Wiring: Junipers which are produced for Bonsai purposes are already wired quite heavily in most cases when they are still very young. Dramatically twisted shapes are very popular and correspond with the natural shapes that used to grow in the Japanese mountains in former times. Junipers can be strongly bent, if necessary wrapped with raffia or tape as a protection, but you must be careful with parts which possess deadwood. Those parts break easily. If they are large and old, you can split the deadwood off in order to bend the more flexible living parts. The foliage pads should be wired and fanned out after thinning when necessary, to let light and air get in. Otherwise the inner parts of the foliage pads will die. In addition to this, the danger of pest infestation is increased if the pads are too dense. From the aesthetic point of view we also want to achieve unobstructed structures and want to prevent the juniper from looking like broccoli.
Repotting: Once every two years, very old trees at longer intervals, using a basic (or somewhat more draining) soil mixture. Don't prune the roots too aggressively. I'd suggest the Bonsai potting soil mixture, click here for customer review details on Amazon.
Propagation: Use seeds or cuttings.
Acquisition of juniper Bonsai: Many well-suited juniper species in different sizes are offered in most nurseries. You can often find good Bonsai raw material there. In gardens, concrete pots and on cemeteries on old graves that will be cleared there are often quite old junipers and if you are lucky the owner will allow you to dig one out for little money or a new plant. Specialized Bonsai traders offer everything from young plants, pre-Bonsai and pre-styled juniper trees up to high-value Bonsai, in various styles and shapes.
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