Daffodil cultivation techniques

Daffodil cultivation techniques:

Cold treatment is essential for most daffodil varieties, similar to many other bulbous plants. Unlike tulips, which grow taller stems to support flowers, daffodils require a cold cycle to ensure proper growth and blooming. The ideal temperature for this cold cycle is 9°C or lower. However, bulbs that undergo a colder cycle at 5–2°C may produce shorter plants compared to those treated at 9°C. There are two main methods for cultivating daffodils: using plastic containers or growing them in bauxite within mobile greenhouses. All these methods typically involve one or more periods of cold treatment to optimize flowering.

Flower development: Since the flower buds have already started forming before the bulb is dug up, the temperature after digging has minimal impact on flower formation. However, if you dig up the bulbs earlier and apply temperature treatments, you can advance the flowering period to as early as November.

To have daffodils ready for Christmas or January, a short heat treatment can be applied to the bulbs. This helps speed up the flowering process, reduces the time needed in the greenhouse, and ensures uniform growth. Before starting the cold treatment or planting, it's recommended to keep the bulbs at 17°C for two weeks. This pre-treatment not only promotes faster blooming but also improves the overall quality of the flowers and makes the crop more consistent.

Uses: Daffodils are commonly sold as cut flowers or potted plants. When grown in greenhouse soil, they can bloom successfully. However, bauxite in greenhouses is mainly used for producing cut flowers, not for potted varieties.

Plastic box method: One approach involves planting the daffodil bulbs in plastic boxes without prior cold treatment. These bulbs are then placed in a rooting chamber or outdoor planting table to go through the full cold cycle. This type of daffodil is known as "uncooled narcissus." Alternatively, the bulbs can be partially cooled before being planted in the plastic boxes, and then given the remaining cold treatment. These are referred to as "9°C pre-cooled narcissus."

Greenhouse bauxite promotion: Both pre-cooled and uncooled daffodils at 9°C can be grown in bauxite within greenhouses. These bulbs naturally receive most or all of their required cold cycle in the bauxite. If the bulbs have only received partial cooling, they should be placed in a freezer set to 9°C for the remaining cycle.

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