In September, the autumn sowing is the best, 700 seeds per gram. The suitable temperature for germination is 13 ℃ to 16 ℃. It takes about 100-110 days from sowing to flowering.
From May to June, cut off the sprouting branches at the base of the plant, insert them into the peat, keep the air moist, and then 15-20 natural roots are planted, with a high survival rate.
It is often carried out after anthesis. The new shoots with roots sprouting from the lateral branches or rhizomes with adventitious roots can be cut off, potted directly, and put in the half shade for recovery.
The suitable temperature for the germination of iris is 18-21 ℃, and the growth temperature is 10-13 ℃ in 7-10 days under the condition of dark. The flowers will bloom 14-15 weeks after sowing. If the temperature is too high during sowing, it will affect the germination of seeds and the growth of seedlings, resulting in low seedling rate. The soil temperature of Viola tricolor seedlings is 15-24 ℃, the lower the temperature, the slower the growth of plants, the stronger the plants.
After sowing, cover the seeds with vermiculite, keep the soil temperature at 18-24 ℃, keep the medium moist, do not need light before the bacon grows out, generally 7-14 days can sprout.
Before watering, let the soil dry thoroughly but avoid the permanent wilting of plants, which is beneficial to the growth of Pansy root. The pH of the soil should be kept at 5.5-5.8, and some N fertilizer or potassium nitrate fertilizer should be applied alternately.
