How to Grow Christmas Cactus? Detailed Guide to Cultivation Methods and Precautions

The Christmas cactus, also known as Christmas cactus, crab claw lotus, fairy finger flower, icing on the cake, etc., is an epiphytic succulent plant of the genus Schlumbergera in the cactus family, native to Brazil. It is commonly cultivated as an ornamental plant in parks and flower nurseries across China, and is often grafted onto Hylocereus undatus or other rootstocks to obtain vigorously growing plants. Let us take a look at the cultivation methods and precautions for the Christmas cactus!

The Growing Environment of the Christmas Cactus

The Christmas cactus is commonly cultivated in tropical and subtropical regions worldwide. It prefers cool and warm environments, is relatively drought-tolerant, fears high summer heat, and is fairly shade-tolerant. The optimal growing temperature is 20-25°C, and the dormancy temperature is around 15°C. It prefers loose, organic-rich, well-draining and breathable substrates. The Christmas cactus is a short-day plant. Under conditions of 8-10 hours of sunlight per day, it can bloom in 2-3 months. The flowering period can be regulated by controlling light.

Grafting Techniques for the Christmas Cactus

1. Grafting time: The suitable time for grafting the Christmas cactus is from late March to mid-June and from mid-September to mid-October, but late spring and early summer grafting is best. Grafting should be done on a sunny morning, as the rootstock and scion contain more sap at this time, allowing the graft union to heal.

2. Rootstock selection: For grafting the Christmas cactus, select a one-year-old cactus branch segment that is elongated, not too thick but vigorously growing, and free of pests and diseases as the rootstock, with a length of 8-12 cm. Remove it from the parent plant, cut the bottom end flat, insert it into sandy loam, and cultivate for 2-3 months. Once it has taken root, it can be used as a grafting rootstock.

3. Scion selection: For grafting the Christmas cactus, select a healthy mother Christmas cactus plant and choose a tender top branch of the current year with nodes as the scion, with a length of 3-4 cm (if the scion is too long, the growth vigor after sprouting will be weaker). Use an alcohol-sterilized blade to cut both sides of the lower part of the scion into a wedge shape, with a cut length of about 0.8-1.2 cm.

4. Grafting method: First, cut both sides of the base segment of the scion diagonally into a duck-bill shape. The cut surface length is 1.5-2.5 cm, and it is best to make the cut in one stroke to facilitate survival. Then make a vertical cut at the top of the rootstock, with the width and depth of the cut slightly larger than the scion cut surface. Quickly insert the prepared scion into the rootstock cut and secure it. Finally, place the grafted pot in a cool, ventilated place sheltered from wind and rain. It is expected to survive in about 20-30 days.

Cultivation Methods for the Christmas Cactus

1. Pot selection: For the Christmas cactus, clay pots, plastic pots, porcelain pots, or ceramic pots can be used, but clay pots are best. To coordinate with home decor, plastic pots with color variations can be used for cultivation. It is advisable to choose a pot with a diameter about 2/3 of the plant's crown diameter.

2. Soil preparation: The Christmas cactus prefers fertile, loose soil. At home, you can use 3 parts garden soil, 4 parts leaf mold, 3 parts sand, or 4 parts peat soil, 2 parts leaf mold, 2 parts sand, 2 parts perlite (or volcanic rock). After mixing the soil, it is best to sterilize it at high temperature before use, or you can sun-expose it to sterilize.

3. Proper watering: The Christmas cactus is an epiphytic cactus that in its natural environment often grows on trees or in moist valleys, so the cultivation environment requires semi-shade and moisture, but the potting soil must not be too wet. Follow the principle of “water thoroughly when dry.” In hot seasons, water once every 2 to 3 days, and avoid watering at noon. In winter when temperatures are lower, water once a week, and avoid watering in the evening.

4. Timely fertilization: The Christmas cactus loves fertilizer. When fertilizer is sufficient, there are more branches and more flowers. Start fertilizing after leaf buds emerge. During the growing season, apply a top dressing of fermented 10x diluted liquid fertilizer mixed with an equal amount of 1000x potassium dihydrogen phosphate solution or 1000x “Huaduoduo” general-purpose fertilizer once every 15-20 days. Reduce fertilization frequency in late autumn, and stop fertilizing when the temperature is below 10°C. Do not fertilize during high summer temperatures or low winter temperatures.

5. Light control: The Christmas cactus fears hot high temperatures and should not be exposed to direct sun or rain, so in summer it should be placed in a ventilated indoor spot or on a balcony facing away from the sun. After the Start of Autumn, the Christmas cactus gradually recovers its growth and should be placed in a location with 50% light exposure, such as a shade shed or a sunny window, to receive light and promote flower bud differentiation. As the weather turns cooler, gradually increase light exposure. From late autumn to winter, provide sufficient light.

6. Flowering regulation: The Christmas cactus is a short-day plant, and the flowering period can be controlled by regulating light duration. To force blooming, begin short-day treatment 60 to 70 days before the desired flowering time, providing 8 hours of natural light per day and shading for the rest of the time. Continue shading without interruption, and flower buds can generally be seen after about 20 days.

Precautions for Growing the Christmas Cactus

1. After autumn turns cool, the Christmas cactus should be placed in a sunny indoor spot. If it does not receive sufficient sunlight in autumn and winter, the formed flower buds will drop, and flowering will be reduced or absent.

2. When the Christmas cactus plant grows larger, it tends to be top-heavy and needs a trellis for tying and support. Wire or similar materials can be used to build a support frame. After the flowers fade, the spent flowers should be cut off together with the flowering stem segments at the ends, and water control should be noted. After new buds grow, watering can resume to keep the potting soil moist.

3. For potting the grafted Christmas cactus seedlings, the soil can use 3 parts leaf mold, 4 parts garden soil, 3 parts river sand, plus a small amount of organic fertilizer or bone meal as base fertilizer. Generally, repot every 1-2 years. Repotting should be done in spring after the flowers fade.

4. After the Christmas cactus finishes flowering in early spring, there is a dormancy period of about 40 days. At this time, watering should be controlled, but attention should be paid to loosening the soil and keeping the potting soil on the dry side. When new buds begin to emerge at the tips, start watering to keep the potting soil moist, but avoid water accumulation in the pot to prevent root rot.

5. When the Christmas cactus enters the high-temperature summer season, it will be in a dormant or semi-dormant state. Water less to keep the potting soil semi-moist, and avoid rain exposure.

4. After autumn begins, as the weather turns cooler, the Christmas cactus gradually recovers its growth and begins normal watering to keep the potting soil moist. During the bud stage, frequently spray water mist to keep the modified stems and flower buds moist. Watering should be done to keep the soil moist. After flowering, control watering to extend the flowering period.