We get a lot of questions about why your seedlings didn't sprout. Remove cover as soon as germination occurs. Zinnia may be grown from seed sown early indoors and transplanted outside after frost, or sown directly in the garden after frost, or from potted plants. Keep the soil moist but not soggy until germination, and maintain temperatures between 75 and 80 degrees Fahrenheit. This classic summer flower may be seeded directly into the garden after the last frost date. The various crops also differ in the length of time from seed sowing until the seedlings are planted outdoors. Sowing zinnia seeds directly into your garden should be done when the temperatures are above 50 degrees Fahrenheit, both during the daytime and nighttime hours. We get a lot of questions about why your seedlings didn't sprout. Once your zinnia seeds start to turn into plants, prepare them to go outside but don't transplant them right away. Zinnia Germination Information Zinnia is the botanical name for Zinnia How to Sow Zinnia: Best sown indoors, 4 weeks before last frost, at a temperature of 70-75° Germination will occur in 5-7 days; They can also be sown outdoors, after all danger of frost is past in the spring Bookmark . Germination Temperatures and Times; Germination Temperatures and Times. After the last frost, your zinnia flowers can be placed in the garden. Then, as the seed swells, the pressure of the water breaks open the seed coat. Some sprout in early spring in the cold, others in the middle of the summer when it's hot. portulaca, sweet pea, and zinnia germinated as completely with one or both of the warm temperature alternations, 20o-35? Fertilize lightly to encourage growth and plenty of flowers. Seed Planting Depth: Sow on surface, lightly cover. Keep uniformly moist until the seedlings emerge, about 7 days after sowing. Sow seed during summer directly or in trays; germination temperature is 25°C. Stage 2 (days 6-10) Zinnias germinate quickly and after emergence one should place plug trays in a well-ventilated greenhouse with high light. Growing Zinnias from seed. Do not seal the plastic bag and make sure it is not tight. soil temperature. For a cheaper alternative, use paper egg cartons as seed trays that can be planted directly in the garden along with the seedlings. Keep the area lightly moistened. Enjoy them all summer until the first hard frost arrives in fall. Set the tray, pots or flat in a bright area but not in direct sunlight. Once they have two sets of leaves, thin zinnia sprouts so there is one seedling per egg carton section or seed tray compartment, says Burpee. Provide 70-85ºF. Space seedlings 200mm apart; pinch back to encourage bushiness. Source: Premier Tech. Grow Peppermint Stick Zinnias from fresh Zinnia elegans flower seeds. Provide 65-70ºF soil temperature. Zinnia Double Zahara (Zinnia marylandica) Germination Approximate seed count: 10,000 to 17,000 S./oz. Keep uniformly moist until the seedlings emerge, about 7 days after sowing. Zinnia Sowing Instructions Planting Depth:1/2” Seed Spacing:2”-3” Plant Spacing:10”-12”” Days to Germination: 5-10 days Germination Temperature:70°-75°F Zinnia. Starting Indoors: 6-8 weeks before the last frost. Direct seed - After last frost, sow 1/4" deep. However, do not expect substantial growth until temperatures are above 50°F. Once they are hardened, zinnia flowers are ready to be planted in your outdoor garden. Transplant after last frost, space 8-12" apart. young codger Posts: 307. Sow zinnia seeds outdoors directly in soil in late spring or early summer when the soil temperature is at least 70 F for reliable seed germination, or sow the seeds indoors about one month before your location's last expected frost date. Germination Temperature (Fahrenheit) Lighting Days to Germination Weeks Sowing to Planting; Ageratum (Ageratum houstonianum) 70-75: L: 7-10: 8: Snapdragon (Antirrhinum majus) 70: L: 7-14: 8-10: Wax Begonia (Begonia x semperflorens-cultorum) 70-75: L: 14: 10-12: Annual Aster (Callistephus chinensis) 70: L-D: 7-10: 6-8: Vinca (Cathranthus roseus) 70-75: L-D : 14: 10: Cockscomb … Provide even moisture, strong light and good ventilation. Plant them 1⁄2" deep in well-draining, loamy soil with full sun. After sowing, keep the surface of the compost moist but not waterlogged and do not exclude light as this helps germination. Seed Planting Depth: Lightly cover. Germination is the emergence of the seed from dormancy. Transplant out after the danger of frost is gone. Problems Planting Zinnias. Good background bedding and border plants, and excellent cut flowers. Follow Karon on Twitter and Instagram at @karonwarren. Plant them 1⁄2" … The various crops also differ in the length of time from seed sowing until the seedlings are planted outdoors. Is the germination of Zinnia seeds temperature critical? The plants are tougher than other Zinnias and will stand up to nearly any weather conditions, blooming right into fall. Zinnia grandiflora. Patricia Hamilton Reed has written professionally since 1987. Lay a piece of plastic wrap loosely over the top of the soil or slide the tray, pots or flat into a plastic bag. Zinnia grandiflora. Avoid root-bound and transplants when true leaves appear. Reed was editor of the "Grand Ledge Independent" weekly newspaper and a Capitol Hill reporter for the national newsletter "Corporate & Foundation Grants Alert." Plant them 1⁄2" deep in well-draining, loamy soil with full sun. Do not allow plants to become root bound and do not disturb roots; transplant shock may … Germination Temperature: Optimum soil temperatures 65-70ºF. Germination Temperature: Optimum soil temperatures 75-85ºF. Placing the pots away … Germination Temperature: Optimum soil temperatures 65-70ºF. For nearly 20 years, Karon has covered homes, outdoor living and home improvement for print and online publications. Harden-off and transplant out after last frost. The best soil for zinnia flowers is rich in organic matter, but these plants will adapt to most soil conditions. 4. Zinnia flowers need to get used to outdoor conditions before you move them to the ground. Throughout the growing season, make sure the soil remains moist and water as needed to retain moisture. Plug trays with PRO-MIX YP. Lower temperatures will result in slower germination: 5-7 days at 70-75°F (21-24°C). Transplant after last frost, space 8-12" apart. Optimum germination temperature is 76ºF/25ºC. Provide 65-70ºF soil temperature. Planting Zinnia Seeds. Germination requirements (light and temperature) vary among the different annuals and vegetables. Germination Temperature: Optimum soil temperatures 75-85ºF. A fluctuating temperature of … To get an early start on your garden, sow zinnia seeds indoors before the last spring frost. Zinnias (Zinnia elegans) are prized for their profusion of bright, candy-colored flowers when summer heat is at its peak. (3) Needs darkness to germinate. When zinnia seedlings are large enough to handle, thin them out to 23cm (9") apart. The seed itself must go through several steps to awaken. I recently had only a 50% germination success rate with some Zinnia seeds. those whose seeds germinate well at any constant temperature from I7.50 to 22.50 C., and also with temperature alternations; (2) those whose seeds require a temperature cooler than 200 C. for complete germination. Cover seed lightly with vermiculite. Plant them 1⁄2" … Do not allow plants to become root bound and avoid disturbing roots; transplant shock or other stress events may cause double-flowering varieties to produce single blooms for a period following stress. Soil temperature: 75 - 78 degrees fahrenheit Germination lighting: Dark required Germination days: 2 - 5 days Grow on temperature day: 65 - 70 degrees fahrenheit Grow on temperature night: 60 - 65 degrees fahrenheit Weeks indoor: 5 - 8 weeks Plant spread: 16 - 24 inches Plant height: 12-18" Plant type: annual Transplant around last frost, space 6-8" apart. Zinnias are easy to get started from seeds, because their seeds are large and easy to handle, and they germinate quickly. Plant height reaches 22-30”. Germination Temperature: Optimum soil temperatures 75-85ºF. Once your zinnia seedlings reach about 2 1/2 inches to 3 inches in height, decide where you want to plant them in your flower garden. Seed Planting Depth: Lightly cover. In addition to causing a frosty death for zinnias, temperatures from 32 to 50 F can cause foliage die-back and leave the plants susceptible to disease. Seed Planting Depth: Lightly cover. It usually takes up to 60 or 70 days to grow zinnia flowers from seeds to blooms. Once the seedlings start to flower, you will need to deadhead them often to promote more blooms. The other 50% did not appear later-they just failed to germinate. You will notice for some seeds that it is recommended to use alternating day (warmer), night (cooler), temperatures, which is fine if one can provide such conditions. Sow seeds in a well-drained media low in nutrients with a pH between 5.8-6.2. Grown as an annual. and 20?-370 C., as with cooler temperatures. Laboratory studies were conduced to determine the effect of salinity and temperature on seed germination of zinnia plant with two temperature regimes (25 and 30 oC) and 5 levels of salinity (distilled water as control and 3, 6, 9 and 12 dSm-1) in a factorial completely randomized design. Plant height to 45cm (18"). After germination, maintain temperatures at 70 F/21°C during the day and 60– 65 F/16–18°C at night. soil temperature. Zinnia Germination Information Zinnia is the botanical name for Zinnia How to Sow Zinnia: Best sown indoors, 4 weeks before last frost, at a temperature of 70-75° Germination will occur in 5-7 days; They can also be sown outdoors, after all danger of frost is past in the spring Temperatures below 60 °F (15 °C) delays flowering. Germination Temperature: Optimum soil temperatures 75-85ºF. Temperatures below minimum can leave seed vulnerable to mold or hungry wildlife. Plant seeds directly in the garden when the soil is warm. Planting Soleado zinnia seeds in the spring results in a jubilant display of single flowers with two-tone orange petals surrounding concentric circles of mahogany and yellow. soil temperature. A germination temperature of 22 C (72 F) is suitable. Starting Indoors: Start indoors 4-6 weeks before the last frost. How to Germinate Calendula Pacific Beauty Mix Seeds, Missouri Botanical Garden: Zinnia Elegans, Purdue University Cooperative Extension Service: Starting Seeds Indoors, Sakata Ornamentals: Zinnia "Profusion Double", Renee's Garden: Bold and Beautiful Zinnias, How to Move Vegetable Seedlings From Indoors to Outdoors, How to Care for a Potted Yellow China Mum. The daisy-like flowers may be single, semi-double or double, in shades of scarlet, rose, orange, yellow or white. For high-quality germination use always Potting Mix. For many plants, the minimum germination time was found to be 50F (10C). Annual Germination: 7-10 days. The Old Farmer's Almanac: Growing Zinnias. Keep uniformly moist until the seedlings emerge, about 7 days after sowing. Dimock A.W., Osborn J.H., 1943. Or, start indoors: plant 1⁄2" deep in a good seed-starting medium at 70° to 75°F 4 weeks prior to the last frost date. Starting Indoors: 6-8 weeks before the last frost. After cotyledon expansion, apply 50-75 ppm N from a Cal/Mag formulation (13-2-13-6 Ca-3Mg). A staple in the home garden for generations, zinnias (Zinnia elegans) are flowering annuals that make a perfect addition to a garden or patio with bright, colorful flowers for summer. The following chart provides germination information for many of the commonly grown annual flowers. Transplant out after the danger of frost is gone. Germination Temperature: Optimum soil temperatures 75-85ºF. Sow a few seeds every 8-12". Be sure they won't be affected by any last frosts. Zinnias are sensitive to frost, so do not seed until the last frost has passed. They should be sown close to the surface of the soil. After sowing, do not exclude light as this helps germination. They should be sown close to the surface of the soil. (4) Direct sow in the garden as soon as the soil warms to at least 55°F. A 20 degree germination temp is stated as the requirement. Provide 70-85ºF. The optimal temperature range for germination was found to be between 60 and 68F (15 and 20C) for the majority of herbs, plants, and vegetables. The following chart provides germination and growing … Germination Temperature:70°-75°F Zinnia. The area should have good drainage because zinnia flowers don't like to be wet. Without the right soil temperature range, germination can be delayed or prevented, and the germination rate will decrease. They should flower 10 weeks from germination. Seeds don't need any advance treatment. Results Once the danger of frost has passed, zinnias can be transplanted outside. soil temperature. Post #6744273. (5) Germination may be slow and erratic. (3) Needs darkness to germinate. The annuals are 8 inches to 4 feet tall, growing from seeds that germinate well when the soil temperature is 70 to 80 degrees Fahrenheit. Zinnia Sowing Instructions Planting Depth:1/2” Seed Spacing:2”-3” Plant Spacing:10”-12”” Days to Germination: 5-10 days Germination Temperature:70°-75°F Zinnia. Each bloom is made up of rows and rows of petals atop long stems. will decrease germination. Zinnias are easy to germinate indoors and should sprout within a week after sowing. Zinnia Sowing Instructions Planting Depth:1/2” Seed Spacing:2”-3” Plant Spacing:10”-12”” Days to Germination: 5-10 days Germination Temperature:70°-75°F Zinnia. Plant them 1⁄2" deep in well-draining, loamy soil with full sun. Sowing Plug Tray Size: Can be produced in 288, 200 or similar cell size plug trays. Wait until the zinnia sprouts are at least three or four weeks old before applying any fertilizer. Soil temperature is just as important as proper moisture to quickly achieve optimal germination rate. Tomatoes, lettuce, impatiens, marigolds, zinnia, basil, etc. Annual Germination: 7-10 days. Zinnia haageana. Annual Germination: 7-10 days. Higher temperatures can reduce germination and cause week seedlings. Generally, zinnia seeds will start to sprout between seven and 10 days. After germination, maintain temperatures at 70F/21°C during the day and 60– 65F/16–18°C at night. Zinnia Germination Information Zinnia is the botanical name for Zinnia How to Sow Zinnia: Best sown indoors, 4 weeks before last frost, at a temperature of 70-75° Germination will occur in 5-7 days; They can also be sown outdoors, after all danger of frost is past in the spring The following chart provides germination and growing information for commonly grown annual flowers and vegetables. These plants do not like transplant, its seeds sow directly in the garden, you can grow very easily. But most people are unable to provide those temperatures in a home setting, so just use the overall 70 degree F recommendation and the seeds should germinate well. Annual Germination: 7-10 days. Start seeds indoors about 6 weeks before the last spring frost, sowing them in a moistened, soilless mixture in flats or small pots. Remove the flat or tray from the water after the soil is thoroughly moistened. may perform better in a fine peat-fine vermiculite germination medium while spinach, thyme, begonia, pansy, vinca prefer a faster drying fine perlite-fine peat germination medium. The zinnia seeds usually germinate very quickly, sometimes in as little as three days and at most usually seven. These germination times are extremely important. well. An easy way to do this is to set the flat, pots or tray in a container of water so the water seeps up into the soil. All vegetables are different and sprout in different conditions. Peppermint Stick will grow to a mature height of roughly 24 to 36 inches tall and is much like the Candy Stripe Zinnia. Plant them 1⁄2" … Starting Indoors: Start indoors 4-6 weeks before the last frost. Once above ground, seedlings -- and even properly hardened-off plants -- are cold-sensitive and die if hit by a spring frost. Zinnia haageana. Annual Germination: 7-10 days. When the seedlings are 7.5 cm (3″) tall, thin smaller varieties to 25 cm (10″) apart and larger varieties to 35 cm (14″) apart. Transplant after last frost, space 8-12" apart. Transplant around last frost, space 6-8" apart. Keep soil moist, but not soggy until germination and maintain temperatures between 23 and 26 °C. are traditional, easy-to-grow additions to annual summer flower beds. Quote. HortSci. Sow a round of seeds every week or so for several weeks to … Boron should be applied at 0.25 ppm to ensure healthy growth. Phytopathology 33: 372-381. Zinnia haageana. Start seed indoors 4 weeks before the last frost. Moisten the soil evenly with water before planting the zinnia seeds. Seed Planting Depth: Lightly cover. Keep in mind that even a dead seed can absorb water, so this should not be used as a viability test. Provide 70-85ºF. Do this by setting them outside in a covered area like a covered porch or a carport for at least a week before transplanting them. Seedlings can go outdoors when the temperature overnight is consistently above 50 F. Harden off, or acclimate, the seedlings during a two-week period, taking them outdoors for short periods every day; place them in a protected, shady area during the first part of those two weeks, and slowly move them to the full-sun exposure zinnias need to thrive.
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