There are not synonyms for this plant
Echinopsis ‘Haku-jo’ is native to Japan and has garden origin.
Echinopsis ‘Haku-jo’ is a beautiful and original cactus belonging to the Cactaceae botanical family. The plant can be solitary or clumps forming, it is unbranched and forms many offsets at the base. The stem is made of prominent ribs covered by large woolly areoles. The areoles have a velvety line between them so it seems like the areoles are connected with each other. The spines are numerous, long, sharp greyish to yellowish with darker tips. The blooming occurs during the spring and the blossoms are borne near the apex of the stem. The flowers are funnel-shaped, large, creamy white and are scented.
This is a fast growing plant, easy to cultivate. For this succulent the best exposure is direct sunlight, so you can place it outdoors but be careful in the hottest days. Long exposure to direct sun-light can cause burns and burnt spots. The maximum resistance to cold is 10 °C so it is recommended not to expose the plant to lower temperatures. Too low temperatures can cause the stem or leaves to break due to water freezing inside the tissues. Temperatures between 10 and 15 °C allow the plants to enter vegetative rest which is essential for the flowering of the following year. Plants should not be placed inside the house where average temperatures of 20 degrees prevent vegetative rest. The best draining soil for this genus is made up of 40% fertile loam, 40% pumice and 20% coarse sand. The pumice should always be placed on the bottom of the pot. Remember to use a perforating pot to drain excess water. Watering can be done regularly during the vegetative period. During the vegetative period you can water the plant every 5 days with half a glass of water, checking that the soil is completely dry before watering again; in winter you should stop the watering to allow the plant to enter dormancy. Decrease the amount of water if the plant is kept indoors or if the pot is smaller than 12 cm. The plant must be fed with a high potassium fertilizer in the summer. You can dilute the fertilizer once a month in the irrigation water. If the pot starts to be too small for the plant you can repot the plant in a pot 2 cm wider. Repotting should be done early in the growing season with fresh new potting soil; it is usually done every 3-4 years. Be careful to red spiders and mealy bugs.
Propagation can be done by cutting or by grafting. By cutting you can use the offsets during the spring. Cut an offset and then let it dry; after a few days the cut surface will dry and a callus will form, then place the cutting in a mixture of sand, soil and pumice. To increase the success of propagation you can make two or more cuttings at the same time. It is advisable to use rooting hormone at the base of the cut to energize root development. For cuttings it is recommended temperatures around 20 °C. By grafting make the cut as close to the growing tip as possible, then chose a stock with a diameter similar to that of the scion. After the cut, wash away the latex until it no longer remains. Bring the scion closer to the stock and held together with elastic bands. The plants should be left in an airy and shady place for 7-10 days before the bands are removed.
As for Echinocactus and Echinocereus genres, the name comes from Latin word Echinos, that means porcupine, which indicates the presence of numerous and robust thorns. In this variant, even the -opsis suffix reinforces this concept as it means “the look of”. Compared to its thorny relatives, however, the Echinopsis gives you abundant and frequent blooms.
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