Cultural Information for: Aster Matsumoto Annual
Common Name: Aster
Botanical Name: Callistephus chinensis
Seed Count: 13,000-17,000/ounce 450-600/gram
Optimum Germination Temperature: 70ºF / 21ºC
Optimum Growing Temperature: 60-70ºF / 15-21ºC
Plug Production – 4 weeks (288 / 12 x 24 tray)
Stage 1 (days 1-7) Select a well-drained sterile media with a pH between 5.8-6.2. Prior to sowing, water the plug tray to the point of drip. Sow the seed and cover with medium vermiculite. Do not water the seeds after sowing or the day following sowing. Maintain even moisture and a soil temperature of 70ºF/21ºC. Water the seedlings as needed allowing the media to dry slightly in between watering. An overly wet soil will decrease germination.
Stage 2 (days 8-15) After seedlings begin to emerge,
move the plug trays to a bright greenhouse and reduce the air humidity and temperature to between 60-70°F/16-21°C. Lightly feed with 100 ppm N from a well balanced fertilizer. Asters are sensitive to Boron deficiency so maintain optimum pH levels (5.8 - 6.2) and consider applying 0.25 ppm Boron with each irrigation/fertilization.
Stage 3 (days 16-24) Provide plenty of light and air circulation and fertilize the plugs as needed to maintain healthy tissue with 100-150 ppm N from a well-balanced fertilizer. The use of Calcium Nitrate based fertilizers is recommended to help build strong stems and roots.
Stage 4 (days 25-28) Plugs are ready for transplanting into flower beds. Aster Matsumoto is sensitive to day length and stress conditions. In order to maximize stem length for cut flowers DO NOT DELAY TRANSPLANTING!
Cut flower Production
Growing: Maintain good air circulation and temperatures between 60 -70°F/15-21°C. Fertilize as needed to maintain a soil EC of 0.7 to 1.0 mmhos (1:2 slurry). Soil EC under
0.5 mmhos will cause lower leaves to yellow. Soil EC above 1.0 will result in large foliage, delayed flowering and shorter vase life. Asters have sturdy stems, but additional support is generally needed.
Flowering: Bud formation begins under long days (>16 hours) with final development under short day conditions. In general, Aster Matsumoto flowers in 13-14 weeks (90-100 days) after sowing.
Natural Season Flowering without photoperiod manipulation
Area Sow Harvest
Warm Area March July (16 weeks)
Cool Area April July/August (14 weeks)
*For W inter flowering, provide 4 hours of supplemental lighting for 3 weeks from 10 p.m. to 2 a.m. at the 5th true leaf stage and then apply short day conditions (<12 hours). If plants are too short, maintain lighting for longer than 3
weeks to add height and delay flowering. Stems should be
2/3rd final height at the start of short days.
*For late Summer to Autumn flowering provide short days, (less than 12 hours of light), in the plug stage when sowing May to July to ensure sufficient stem length. To ensure proper development and stem length provide long days at the 5th true leaf stage by lighting from 10 p.m. – 2 a.m. followed by short days when the crop is 2/3rd’s the final
Post Harvest Care: Cut stems when 2-3 flowers are 1/4 open. Strip off bottom leaves and place stems in tepid water in a cool area to allow for rehydration.
Transplanting: Space plants 4 x 5 inches/10 x 12.5 cm apart in beds with a rich soil full of organic matter where Asters were not previously grown the year before. Matsumoto is tolerant of stem rot (fusarium) and can be grown in the same field every other year. NEVER GROW in
the same field more than two years in a row.
“Information copied from the breeder.
Muller will not accept any liability for failure and/or damage as a consequence of incorrect and/or inexpert cultivation by or on behalf of the Buyer.”