How to Grow Dahlias? Detailed Guide to Planting Methods and Precautions

Dahlia, as the name suggests, is a very impressive and beautiful flower, and that is indeed true! Everyone who has seen a dahlia cannot help but admire its beauty. Such an impressive and noble flower is not commonly seen, and it is even honored as the national flower of Mexico. So how should such a gorgeous dahlia be cultivated? Let's learn about it together with the editor below!

How to Grow Dahlias

We evenly scatter the dahlia seeds on the soil prepared for planting, then evenly spread moist, fine soil over the dahlia seeds. Then we can cover them with a layer of plastic film, and this film should have a little gap from the soil, which helps with ventilation and can retain moisture and warmth. After sowing, the temperature of the growing environment is best kept between 20°C—25°C. After about seven days, the dahlia seeds will begin to sprout. After that, water frequently to keep the soil moist. After sowing, ventilate frequently. When the seeds germinate, pay attention to providing shade, but once the dahlia seedlings emerge evenly, remove the plastic film and move them to a place with sufficient sunlight for growing.

Dahlia Planting Methods and Precautions

1. Soil requirements: Dahlias are suitable for cultivation in loose, well-drained, fertile sandy soil.

2. Proper fertilization: Dahlia is a fertilizer-loving plant and must have a sufficient supply of fertilizer, otherwise the flowers tend to become smaller, the color dull, and the ornamental value reduced. According to growth conditions, apply cake fertilizer 4~5 times as a top dressing. Light fertilizer is preferable. When summer high temperatures exceed 30°C, fertilization is prohibited.

3. Water control: Under normal circumstances, watering should be appropriately reduced, which helps control plant growth and encourages thick dahlia stems, shorter plants, and larger flowers. During summer high temperatures, while basically meeting its water needs, spray water on the leaves as much as possible, at least twice a day, to make up for evaporation loss.

4. Light environment: Dahlia prefers partial shade. Too strong sunlight affects flowering. The light duration is generally 10~12 hours. When cultivating seedlings, avoid direct sunlight.

5. Temperature requirements: Keep the daytime temperature at around 25°C. If it exceeds 25°C, ventilation and cooling are necessary. When the nighttime temperature is below 10°C, raise the indoor temperature. After September, deliberately raise the temperature of the surrounding micro-environment during the day, so that daytime temperatures are high and nighttime temperatures are low. A larger day-night temperature difference is extremely beneficial for the dahlia's flower color and the enlargement of its tuberous roots.

6. Humidity requirements: Dahlia prefers a cool climate, with 10~25°C being most suitable. During hot seasons, cooling measures should be taken. According to weather conditions, spray water on the leaves and ground 3~4 times a day to achieve the purpose of cooling and controlling water.

7. Precautions: Dahlias generally mainly suffer from problems such as powdery mildew, gray mold, bacterial wilt, and viral diseases. Pay attention to regularly spraying chemicals for treatment.

How to Dwarf Dahlias

1. Choose dwarf varieties

Plants also have heredity. When planting, you must understand this clearly and choose dwarfed varieties. Do not choose tall varieties, otherwise they will be very difficult to control after you bring them home.

2. Promote dwarfing through cuttings

If you want dahlias not to grow tall, you can take cuttings yourself for a pot. Choose axillary buds or flower-bearing branches from the mother dahlia plant for cuttings. Using such branches for cuttings can limit plant height and is also beneficial for dwarfing the plant.

3. Repotting and bending roots

During the growth of dahlias, repotting should be carried out multiple times. When repotting, cut off some excess fibrous roots and bury the stem plate in the potting soil to encourage adventitious roots to grow from the stem nodes. At the same time, pay attention to water control and carry out seedling hardening, thereby achieving the purpose of dwarfing.

What to Do If Dahlias Do Not Bloom

1. Increase light

Whether light is sufficient is key to growing dahlias. Insufficient light will cause branches to grow excessively and become weak. Because the plant's internal nutrients are insufficient, it will also be unable to bloom or will bloom less.

2. Increase fertilization

Before planting or before the plant sprouts, sufficient base fertilizer must be applied. If the base fertilizer is insufficient, appropriately increase the number of top dressings.

3. Strengthen frost protection

If in a relatively cold region, after winter begins, some dry grass, etc., should be spread on the ground, or the dahlia's tuberous roots should be dug out and dried, then stored indoors, and potted or planted in the ground around Qingming of the following year.

Through the above content, I believe everyone has gained a certain understanding of dahlia planting methods. Dahlias are colorful and very lovable. They are one of the world's famous flowers. If you grow a pot at home, it is absolutely classy!