Rehmannia cultivation methods: The complete process of Rehmannia seeding and division.

How to Propagate Ruwei Flowers

As the queen of flowering plants in the succulent world, Ruwei flowers are deeply loved by gardening enthusiasts for their bright colors and robust vitality. Mastering the correct propagation techniques not only allows for the cultivation of new plants but also preserves the characteristics of the variety. This article systematically analyzes the operational details of the two mainstream propagation methods: seeding and dividing, to help you easily achieve large-scale cultivation of Ruwei flowers.

Full Process Analysis of Ruwei Flower Seed Propagation

Sowing Time and Temperature Control

The best sowing period is from October to November, when the day-night temperature difference is maintained between 10-20°C. In the northern regions, it can be advanced to mid-to-late September, while in the south, it is recommended to delay until early December. Use a thermometer to monitor in real-time; when the ambient temperature is greater than 25°C, start the shading and cooling device.

Seed Pretreatment Technology

Use the low-temperature stratification method: wrap the seeds in moist vermiculite, seal them in a bag and refrigerate (5°C) for 14 days, then transfer to a dark room at 15°C. As soon as the radicle breaks through the seed coat, start sowing immediately; light at this stage will inhibit germination rates.

Substrate Formula and Sowing Techniques

Prepare a mixed substrate of peat soil: akadama soil: perlite = 3:2:1, with a 2cm thick layer of ceramsite at the bottom for drainage. Use the broadcasting method to evenly distribute the seeds, then cover with 3mm fine river sand. Maintain 60% substrate humidity, and seedlings can be seen within 5-7 days.

Guide to Propagating Ruwei Flowers by Division

Choosing the Right Time for Division

It is recommended to do this from late March to mid-April when the mother plant has completed its flower bud differentiation and new roots are vigorous. Choose to operate on consecutive sunny days, and controlling air humidity between 50%-60% can effectively shorten the acclimatization period.

Scientific Proportions for Division Substrate

Use a formula of decomposed leaf soil: kusakai soil: rice husk charcoal = 5:3:2, adding 5g of sulfur powder per liter of substrate to adjust the pH to 5.5-6.0. Before potting, water the substrate thoroughly with a fungicide solution (800 times dilution of carbendazim) to prevent fungal infections.

Standard Steps for Division Operations

After removing the pot, retain 1/3 of the protective soil, and use a sterilized bamboo strip to divide the root mass along natural growth gaps. Each clump should have 3-5 complete main roots and 2 or more growing points. Plant at the same depth as the original soil mark, compact and water thoroughly, then place in a scattered light area for maintenance.

Key Points for Post-Propagation Management of Ruwei Flowers

For seedlings, spray 1/4 concentration of seaweed fertilizer weekly after the true leaves unfold, and for division seedlings, it is recommended to use a 2000 times solution of indole-3-butyric acid to promote root growth. Both methods need to pay attention to: shading rate greater than 50% in summer, and maintaining a winter overwintering temperature of above 5°C. Through scientific management, seedlings can bloom the following year, and division seedlings can flower in the same year.