A Detailed Guide to the Cultivation Techniques and Propagation Methods of Spiraea japonica

Flowers & Gardening Jan 1, 1970 0 views

Cultivation Techniques for Spiraea japonica; Propagation Methods for Spiraea japonica

Spiraea japonica has a long flowering period and brilliant flower colors, with dense and showy flower clusters that create an excellent ornamental effect. So how do you cultivate Spiraea japonica? What propagation methods are there? Let's find out together below.

I. Cultivation Methods for Spiraea japonica

1. Land preparation and bed making: Deeply plow and loosen the soil. Generally, the seedling bed should be plowed 15-20era deep, carefully leveled, compacted, and cleared of debris. When making the bed, the soil should be disinfected. Set up reed curtain shading on the cutting bed. If conditions permit, add a layer of base fertilizer (farmyard manure) at the bottom of the bed, and at the same time mix in 1:5000 carbendazim for disinfection. Mix fertile loam and river sand at 1:1 as the upper layer soil of the seedling bed, then water the seedlings thoroughly.

2. Cutting collection and insertion: Collect current-year softwood branches. From mid-to-late June to early-to-mid July, use cuttings taken directly from clustered hard branches growing from the rhizome, as well as softwood cuttings growing from hard branches. The cutting length is 10-12cm, none with terminal buds. Cut cuttings with 4-5 buds, cutting thickness 0.2em or more, retain 2-3 nodes of leaves at the upper end, cut to 8era long, keep the upper 2 leaves, and remove the lower 2-3 nodes of leaves and the upper flower spikes. The part inserted into the soil at the lower end should have plump buds. After insertion, spray thoroughly with water so that the cuttings and substrate are tightly combined.

3. Shading and film covering: For open-field cuttings, build a shade shed, with 75% shading coverage. If cutting under trees, the trees in the forest can provide shade. When cuttings are inserted in the seedling bed, cover with plastic film and build it into an arch shape, with an arch height of 60em.

4. Transplanting: Transplant in the following spring. Generally, combine with transplanting in February-March. Separate the sucker shoots from the mother plant, prune appropriately, and plant separately. You can also fertilize the soil before division to encourage the mother plant to produce more suckers. When transplanting, first dig a hole, water it, transplant with water, and cover with soil and press firm. If cutting in a greenhouse, you can cut at any time until autumn, and can also sell while cutting. In the 2nd year, they can be dug up and planted separately.

5. Maintenance and management: To improve the survival rate of planting, keep a small section of roots when lifting seedlings. Through thinning branches and heading back, reduce water evaporation from the plant body and promote survival. After cuttings are inserted, the film should be tightly covered, water once a day, using a fine-nozzle watering can for spraying; on cloudy days, water thoroughly once every 2 days. After 15 days of cutting, rooting basically begins. At this time, spray thiophanate, once every 7 days, spraying continuously 2 times is sufficient. Note that the humidity inside the shed bed should be maintained at 80%-90%, and the temperature below 28°C. When it exceeds 28°C, open the plastic film for ventilation and cooling.

II. Propagation Methods for Spiraea japonica

Propagation by division, cuttings, or sowing. After flowering, pruning should be carried out to remove spent flowers.

1. Division propagation: Division is generally combined with transplanting in February-March. Separate the sucker shoots from the mother plant, prune appropriately, and plant separately. You can also add fertilizer soil before division to encourage the mother plant to produce more suckers, and then dig up and plant separately in the 2nd year.

2. Cutting propagation: Both softwood and hardwood can be used for cuttings, but softwood is clearly superior to hardwood.

3. Sowing propagation: After the seeds mature in autumn, pick, sun-dry, thresh, and store them. In the following spring, take out the seeds and sow them in pots. Because the seeds are very small, sowing propagation requires careful attention. Before sowing, first soak the potting soil thoroughly with water, then evenly scatter the seeds, cover with a layer of sieved fine soil, and afterward pay attention to moisture retention. Seedlings emerge in about 1 month. Because sown seedlings are prone to damping-off disease, spray Bordeaux mixture before the disease occurs for prevention and control.

The above is an introduction to the cultivation methods and propagation methods of Spiraea japonica. Friends who like Spiraea japonica should not miss it. If you want to learn more about Spiraea japonica, keep following us.

A Detailed Guide to the Cultivation Techniques and Propagation Methods of Spiraea japonica

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