The method of growing Siebold's primrose

Potting compost: As Siebold's primrose has inherit the characteristics as wild herbs and is grown in flower pots, it is better to use soil with good drainage but able to hold water well. In general, equal weight of leaf mold and wild sand on the basis of garden soil are used.

When buying compost on the market, please follow the ratio as below.
- dark-brown soil (granules)
=> 5
- leaf mold
=> 3 Select one using broadleaves. Bark compost and peat moss are all right.
- sand
=> 2 Kanuma soil, Hyuga soil, Perlight and so on.

It will be better to mix a little smoked charcoal into the soil too. First, mix water into it to make it a little wet. As this compost will become the basis, please make your own potting compost according to your own growing conditions. Since Siebold's primrose have strong adaptation power, compost which grows other plants well is generally okay. It is advise not to put any fertilizer in the compost. Additional fertilizer is preferred after the buds have come out.

Pots : Shigaraki black-painted pots and Tanba incense burner pots especially suitable for the flowers as a decorating platform. These pots can make these flowers look much better and elegant. ( They are a little difficult to obtain. ) If only for cultivation, unglazed pots are a suitable choice, vinyl pots are also good as well. Pots of sizes of No.5 and No.6 are standard. Anyway, it will be fun to plant your favorite species in your favorite pot.

Preparation for plantation: Please use your free time to prepare materials which are necessary for plantation. Soil, leaf mold, fertilizer, pots, labels and so on according to general cultivation of flowering plants. Furthermore, it will be good to mix the potting compost a little earlier.

Transplanting : It is a fundamental rule for Siebold's primrose is to transplant the flower every year. It is also the most important job. Begin this job after the first day of spring (in the traditional Japanese calendar). If for Autumn planting, around November is also okay. The first process is to open the pot. If the buds grow smoothly, a beautiful lump of soil and roots should be found. Then break it to take out the buds by dividing them one by one in order. After that put small rocks into the prepared pot to cover the bottom hole and pour soil in until about the soil reach about the half of the pot's depth. And then arrange four buds of equal size with the same distance apart. After that, pour potting soil about 1cm deep to cover the buds. Finally, leave 3cm from the pot edge for additional soil later. Please be reminded that, plant buds of middle and small sizes together for proliferation.


Diseases and harmful insects: Symptoms of atrophy by viruses will sometimes be found. Though it will be easy to pull the inflected flower out and throw them away, it is very difficult to completely isolate the viruses. There are chances that the flower will still bloom normally even being infected with viruses, so nothing can be done but soothing them to get ride of it. Apart from virus, when seedlings get weak, it is the root-spoiling nematode that cause the damage Roots, which take a long time to grown, will crumble into pieces. Although lumps damage by root-lumping nematode will look ugly, it will not weaken the flowers. Also sometimes Japanese gold beetles lay eggs in the flower pots, their larvae can damage the roots and stems making the buds disappeared.