Zinnia is a plant with short sunshine, so it is necessary to regulate the flowering period by regulating the sunshine length. When the daily illumination is longer than 14 hours, the flowering will be delayed. It takes about 70 days from sowing to flowering, and the tongue flowers will increase significantly; When the sunshine is less than 12 hours, it can bloom in advance. It only takes 60 days from sowing to flowering. At this time, there are more tubular flowers. In addition, the flowering period can also be controlled by adjusting the sowing date and picking time grow table hydroponic.
In the process of sowing, Zinnia chinensis requires a well drained, loose and fertile soil environment. Generally, the germination temperature is 21-22 degrees. It needs to be covered with soil during germination, and it can germinate in 2-5 days. During the growth process, the daily temperature should be kept at 18 degrees and the night temperature should reach 21 degrees. The time from sowing to flowering is generally 9-10 weeks. In addition, it is worth noting that Zingiber grass should avoid continuous cropping and should be rotated in time.
The following measures are usually taken to control it: first, appropriately reduce the temperature, second, ensure sufficient nutritional area and increase the spacing between plants and rows; Third, pick the heart in time to promote the growth of axillary buds. The specific operation method is generally carried out when the plant height is about 10 cm, leaving 2 to 4 pairs of true leaves and picking the heart. If you want to make the plant low and blossom, you often spray dwarfing agent when the axillary buds grow to about 3 cm after picking the heart. For open cultivation of seedlings without overgrowth, coring treatment should also be carried out in order to limit their growth height.
Zinnia has strong growth potential, likes warm, dry and sunny environment, and can tolerate semi shade. The suitable temperature for growth is 20 ~ 25 °C, which is not resistant to heat. When the temperature is higher than 35°C, the growth trend is obviously weakened, the flowers are rare and the flowers are small. It is a short sunshine plant. Under long sunshine (14 hours / day), the plant height increases and there are more tongue flowers; Under short sunshine (9 hours / day), tongue flowers became smaller and tubular flowers increased. It has strong adaptability and does not choose soil, but it grows best in fertile soil with deep soil layer and good drainage. In the case of rainy summer or poor soil drainage, the plants are slender, the flowers become smaller, and continuous cropping is prohibited.
Zinnia is mainly propagated by seeds and can also be propagated by cutting. Seed reproduction is suitable for spring sowing, which is generally carried out in the middle and late April, and the suitable temperature for germination is 15-20°C. Its seeds are photophobic. After sowing, they should be covered with soil, watered and moisturized, and germinate and emerge after about 1 week. The germination rate is generally about 60%. During the period from Xiaoman to the summer solstice, combined with coring and pruning, select strong branches, cut a section of tender branches 10 ~ 15cm long as cuttings, remove the lower leaves, leave the upper two leaves, insert them into the fine river sand, spray water frequently and shade appropriately, and take root after about 2 weeks.
After the survival of colonization, it is not necessary to apply fertilizer too frequently during the seedling raising period. Generally, liquid fertilizer is applied once a month. Near the flowering stage, more topdressing can be applied, and liquid fertilizer can be applied every 5 ~ 7 days until the flowers are in full bloom. When the seedling is up to 10 cm high, leave 2 pairs of leaves, block the head and pick the heart to promote its germination and lateral branches. When the lateral branches grow to 2 ~ 3 pairs of leaves, leave 2 pairs of leaves and pick the heart for the second time. In this way, the plant can be large and have many flowers. After spring sowing, flowers can bloom after 70 days. The hundred day chrysanthemum blooms at the top of the branch. When the flower is broken, leave 2 pairs of leaves at the base of the flower stem in time, and cut off the broken flower, so as to induce new branches at the leaf axil of the incision. Watering frequently after pruning and topdressing 2 ~ 3 times can extend the flowering date to before frost. The first batch of mature seeds before the rainy season are of good quality and should be collected and reserved in time grow table.
When sowing seedlings with 4-6 leaves, they are planted in a 10-12 cm basin. There are few lateral roots of Zinnia, so pay attention to less injury to lateral roots during transplanting. When the seedling height is 10 cm, pick the heart to promote more lateral branches. In production, in order to dwarf plants, spray with 0.5% longer than 2 weeks after picking the heart, and the effect is remarkable. Growth regulating substances can also be used to regulate the flowering period. Spraying 0.25% - 0.4% bijiu solution at the seedling stage can bloom in advance and the flowers are compact; If you spray 0.4% - 0.8% bijiu or chlorzhuang for 2-4 times, the flowering will be delayed. Fertilize once every half month in the seedling stage, and apply phosphorus and potassium fertilizer twice before flower bud formation. Or use "Huiyou" 20-20-20 general fertilizer. If there is no seed left after flowering, the residual flowers need to be removed in time to promote the germination of new lateral branches between leaf axils and bloom again. Seedlings and plants must be isolated to prevent hybridization between varieties and affect seed quality.