How to Propagate Coleus: Detailed Guide to Seed Sowing and Cutting Methods

The leaves of coleus are very beautiful, so some people also call it "laolai bian" (old age change). The leaf colors of coleus are bright and the varieties are diverse. Artificially propagating coleus is not difficult; you can propagate coleus by seed sowing and cuttings.

Coleus

I. Seed Sowing

Sowing seeds and raising seedlings of coleus can produce plants with varied leaf colors. Under suitable conditions, sowing can be done at any time throughout the year. In South China, open-field sowing is usually done from March to April, while in northern greenhouses it is mostly done from February to March. In the north, spring sowing is done in greenhouses, using loose bed soil for sowing. Sift the bed soil through a fine sieve, place it into a sowing bed or seedling tray, press it down slightly and level it, then water thoroughly with a watering can. Sow about 20 grams of seeds per square meter, mix them evenly with fine sand, and broadcast them. After covering with fine soil, keep the soil temperature at around 20°C, and the seeds will sprout in 10-15 days. After sprouting, lower the temperature to 16-18°C. After true leaves grow, prick out the seedlings and grow them into mature seedlings in containers. During the seedling stage, control the daytime temperature at 18-20°C. Water moderately; avoid the seedbed being too wet. When the seedlings grow to 6-10 cm tall, pot them for planting. For open-field cultivation, plant them out after the temperature warms up and stabilizes. Gradually lower the temperature for hardening off 5-7 days before planting out. During the seedling stage, control moisture moderately so as not to cause leaf dehydration and wilting, and to prevent leggy growth and disease occurrence.

II. Cuttings

Coleus easily develops adventitious roots. Some varieties have very poor seed-setting ability and can only be propagated by cuttings. Cutting propagation can be done in all four seasons, with spring and autumn being the best. Cut 5-7 cm from the upper part of the branches as cuttings, and remove the leaves. Insert them into vermiculite, perlite or other substrates, keep them warm at 15-20°C, and they will root in 5-7 days. Water cuttings can also be used. After rooting, transplant them into pots.

Coleus Cutting Propagation Methods: How to Sow Coleus Seeds

Coleus is a plant grown for its ornamental leaves. Its leaves are generally red and green intermixed, and some varieties have different forms, making them very beautiful. Coleus is currently very popular among consumers, and many people want to grow it. However, before growing it, you need to understand its cultivation techniques.

Coleus Cutting Propagation Methods

1. Timing. Coleus propagation methods include seed sowing and cuttings, among which cutting propagation is the simplest. It can be done throughout the year. Apart from winter, when temperatures are low and rooting is slow, spring and summer have suitable temperatures and are the best seasons for cuttings.

2. Branches. Coleus is a perennial herbaceous plant, but at home it is mostly grown as an annual. It is very suitable for propagation by terminal bud cuttings. Select stem nodes with terminal buds, 3-5 nodes, and a length of 5-10 cm as cuttings. After cutting the cuttings, trim some of the leaves to avoid excessive leaf retention causing branch dehydration and cutting failure. Usually, all the lower leaves of the branch should be cut off, and keeping just a few upper leaves is enough.

3. Method. Coleus grows rapidly. You can directly insert a robust branch as a single cutting into a flower pot with a diameter of 7.5 cm. After successful rooting, maintain it directly in the pot. If there is more space at home and the environment is suitable, you can insert cuttings into a larger flower trough.

How to Sow Coleus Seeds

1. Coleus can be sown by the pot-sowing method in all four seasons. First, generally do it in warm March. You can mix decomposed humus soil and plain sandy soil evenly, then put it into a seedling pot.

2. Then place the seedling pot containing the fine sandy soil into water to soak and wet it thoroughly. After that, sow following the method for small seeds, cover with a thin layer of soil, and then cover with a glass plate or plastic film.

3. During this period, keep the pot soil moist and water reasonably. After some time, they will root, sprout and grow into small seedlings, and then you can prick out and transplant them.

How to Water Coleus

1. During periods when the plant grows quickly, replenish water in time and do not let the surrounding environment become too dry. Generally, in spring and autumn, when the pot soil turns white and the clay pot becomes noticeably lighter in weight, you can replenish enough water. But do not overwater, otherwise the plant will grow too tall.

2. In summer, because the leaves of this plant are relatively large, evaporation is also high, so you must water enough. Otherwise, the plant will wilt. However, when watering during this period, first place the plant in a shady place to lower the temperature of the clay pot before watering (this is done so that the plant's roots will not be injured by temperature differences), and water thoroughly. In winter, you must strictly regulate the amount and frequency of watering; you can choose to water once every two to three days.

How to Fertilize Coleus

1. Apply sufficient base fertilizer. When planting coleus, people usually choose soil mixed from 2 parts leaf mold, 2 parts garden soil, and 1 part rice husk ash. Many people neglect applying base fertilizer. Most potted plants bought directly from the market already have prepared soil and base fertilizer applied by the seller. So after taking them home, you can just maintain them directly. But if you repot them yourself, be sure to add some organic fertilizer and bone meal to the pot soil as base fertilizer. In addition, you can add an appropriate amount of phosphate fertilizer to the pot soil, which can promote bright leaf color.

2. Fertilization method. Timely topdressing. Coleus likes fertilizer. During maintenance, apply topdressing in time. During the peak growing season, apply a compound fertilizer once a month. In addition, when fertilizing, you can appropriately increase the proportion of phosphate fertilizer. At the same time, coleus should avoid excessive nitrogen application, otherwise the leaves will be dull. After each pinching, apply cake fertilizer water or human manure once. After autumn begins, the temperature is suitable and growth accelerates, so apply light fertilizer frequently, and if necessary, add 0.1% urea for foliar spraying. Throughout the year, apply dilute liquid fertilizer 3 times.

3. Avoid inconsistency. Coleus likes fertilizer, but it should not be fertilized too much. If watered and fertilized too much, it is very easy to cause leggy growth, with thin, slender and weak leaves, longer branches, overly long internodes, and relatively sparse leaves, greatly reducing ornamental value.

The most common method for coleus is cutting propagation, and the method is also very simple: first choose a suitable time, then propagate. If you want coleus to grow well, fertilizer and water are of course indispensable. Timely watering and fertilizing can make it grow better.

How to Propagate Coleus: Complete Guide to Coleus Propagation Methods

Coleus is an excellent foliage ornamental flower. Depending on the variety, coleus has markings in various colors such as yellow, red, purple, orange, and green, making it a good material for decorating living rooms and studies. So how do you propagate coleus? What are the propagation conditions? Let's take a look together.

I. Coleus Propagation Methods

1. Seed propagation: In early spring in March, propagation can be carried out indoors at around 18°C. Fine sandy soil is best. After sowing, seedlings emerge in 7-8 days. When the seedlings grow 4-5 pairs of leaves, they can be divided and potted. Seedlings grown from seed often show various variations in leaf color, so starting from the small seedling stage, attention should be paid to selecting plants with rich and varied leaf colors for cultivation, and promptly eliminating small seedlings with plain, monotonous leaf colors. During the seedling stage, coleus needs to be pinched multiple times to promote many branches, so that after the plant takes shape it is moderate in height and full and graceful.

2. Cutting propagation: Except in the high-temperature season of July to August, when rooting is not easy, it can be done in other seasons, with May to June being the most ideal. From a robust mother plant, cut 5-10 cm long branches from the upper part of the side branches, each segment containing one leaf with diverse colors and 1-2 leaf buds, and insert them into plain sandy soil, evenly spaced. Then place the pot in a cool, ventilated place, spray water frequently, keep the pot soil moist, and roots will form in about 20 days. After 1 month, the cutting seedlings can be divided and planted.

3. Water propagation: The cutting container can be a wide-mouthed bottle or a mineral water bottle. When the main branch or a side branch after pinching has 4 nodes or is about 10 cm long, choose one with a thick stem, keep only 1 to 2 nodes of opposite leaves at the base, cut off the upper part, and make the cut smooth without crushed or torn wounds. Then, cut off the lowest pair of leaves of the cutting, and gather every 3 to 5 cuttings neatly at the base, loosely tie them together with white thread, and prepare for water propagation. Generally, it is best for the cutting to enter the water 3 cm to 4 cm from the bottle mouth. After that, place it in a place with scattered light, pay attention to changing the clean water once every 2 to 3 days (store water in advance), and make sure to top up the water level in the bottle every day due to evaporation. Generally, under conditions of 18°C to 25°C, white roots can be seen in 7 to 10 days.

II. Coleus Propagation Conditions

1. Water: It likes moisture. In summer, water thoroughly, otherwise wilting is likely to occur. Also spray water on the leaves frequently to maintain a certain air humidity.

2. Fertilizer: Apply more phosphate fertilizer to keep the leaves bright. Avoid excessive nitrogen, otherwise the leaves will be dull.

3. Soil: It requires loose and fertile soil; ordinary garden soil is generally sufficient.

4. Temperature: It likes warmth and has relatively strong cold resistance. The suitable growth temperature is 15-25°C, the overwintering temperature is around 10°C, and when it drops to 5°C, frost damage is likely to occur.

5. Light: It likes sunlight, but avoids exposure to scorching sun.

During the seedling stage, damping-off is likely to occur, so attention should be paid to disinfecting the sowing soil. During the growing period, it can be harmed by leaf spot disease; spray with 500 times dilution of 50% thiophanate-methyl wettable powder. When cultivated indoors, it is prone to harm from scale insects, red spiders and whiteflies, which can be controlled by spraying 1000 times dilution of 40% omethoate emulsifiable concentrate.

The above isColeus Propagation Methodsand an introduction to coleus propagation conditions. We hope it is helpful for everyone in propagating coleus.