Dahlia is large in plant shape, brittle and hollow at the top, long in branches and prone to lodging at flowering stage. So when the main stem grows to 30 cm, insert a small bamboo pole on the edge of the main stem for proper shaping and pruning. The common diseases of Dahlia are rice planthopper, bud worm, powdery mildew, leaf spot and so on, so preventive measures should be taken. Also, when cultivating dahlias, we must pay attention to careful watering, otherwise it will easily cause dahlias to rot.

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Dahlia Rotten Roots —— Soil Problems

Dahlia will have rotten roots and the soil will not be very good.

At that time, dahlias should be cultivated with loose sand instead of heavy clay. If heavy clay is used, Dahlia will suffer from poor growth and even root rot.

When dahlias are raised, if you find rotten roots, you can observe the soil. If the soil is too sticky, the bonsai soil must be removed, and the mixed culture medium of humus soil, garden soil and river sand can be replaced. It's a good thing to pour flowerpots at that time in early spring every year.

Dahlia Rotten Roots-Water Problem

When dahlias are watered, if they are watered too much, or the drainage pipes are blocked by the soil, the soil will look very wet and even have water. Such a thing can easily lead to dahlias rotting.

At this time, two tasks must be done to water dahlias, one is to drain pipes, and the other is to water them. Drainage pipe means that when dahlias are moved to pots, some broken tiles can be placed at the bottom of potted flowerpots or a layer of filtered water can be added. Watering means scientific research on watering, following the standard of not watering, only watering, paying attention to saving water, and preventing root rot under the premise of considering the growth and development requirements of Dahlia.

Dahlia Rotten Roots —— Fertilization Problem

Dahlia is not well fertilized, and the key to root rot is that Dahlia burned its roots because of excessive fertilization.

At that time, dahlias were raised with a thin layer of fertilizer, not some fertilizers that were not fertilized or too thick, which led to root burning and rot.

If fertilizing, you can add some base fertilizer when moving the pot. During the growth and development, dilute liquid fertilizer should be applied every 10 day, and phosphorus and potassium fertilizer should be applied at flowering stage.

When applying fertilizer, most of them are to ensure that the thin fertilizer is not easy to rot.

Through our introduction, I believe everyone has a deeper understanding of the rotten roots of Dahlia.