The Southern Catalpa (Catalpa Bignonioides) is generally described as a perennial tree. This dicot (dicotyledon) is native to the U.S. (United States) has its most active growth period in the spring.
It has green foliage and inconspicuous white flowers, with a moderate amount of conspicuous green fruits or seeds. The greatest bloom is usually observed in the mid spring, with fruit and seed production starting in the summer and continuing until summer. Leaves are not retained year to year.
Catalpa has a long life span relative to most other plant species and a rapid growth rate. At maturity, the typical Southern Catalpa will reach up to 12 m (66') high in 20 years.
Genus - Catalpa
Species - Bignonioides
Common name - Southern Catalpa
Pre-Treatment - Not-required, but recommended
Hardiness zones - 5 - 9
Height - 30'-60' / 9 - 12 m
Spread - 20'-50' / 6 - 15(40) m
Plant type - Tree
Vegetation type - Ornamental deciduous
Exposure - Full Sun, Partial Sun, Partial Shade
Growth rate - Medium
Soil PH - Acidic, Neutral
Soil type - Clay, Loam, Well drained
Water requirements - Average Water
Landscape uses - Feature Plant, Shade Trees, Street Trees
Bloom season - Late Spring, Early Summer
Leaf / Flower color - Green / White
Seeds can be soaked and sown with no pretreatment, but it could increase the germination rate.
1. Soak seeds in warm water for 12-24 hours.
2. Pour the seeds into a plastic storage bag with moist and sterile sand or vermiculite and place the bag into a refrigerator that maintains a temperature of +2C (34F). Keep the seeds in this location for 3-4 weeks.
3. Fill a seed tray with potting soil.
4. Sow on the surface, cover 1-2 mm of soil or vermiculite.
5. Water the soil daily and keep it constantly moist until the Catalpa seeds germinate.
Afterward, water the plants when the top of the soil feels dry.
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