Collected in January 2019 in Lithuania (North Europe, zone 5b). Tested germination rate - 95%,
Northern catalpa is a deciduous very fast growing tree with an irregular to oval form. It is native to a small area in an interior south-central region of the United States. Leaves are medium to dark green and heart-shaped. This catalpa bears fragrant white flowers with yellow and purple markings in spring. These produce long, bean-like fruit pods.
Northern catalpa prefers moist, well-drained soils in full sun to partial shade but tolerates hot, dry conditions. (Info source: Learn2Grow.com)
Genus - Catalpa
Species - Speciosa
Common name - Northern catalpa
Pre-Treatment - Not-required, but recommended
Hardiness zones - 4 - 8
Height - 40'-70' / 12 - 21 (50) m
Spread - 20'-50' / 6 - 15 (50) m
Plant type - Medium Tree
Vegetation type - Deciduous
Exposure - Full Sun, Partial Sun, Partial Shade
Growth rate - Fast
Soil PH - Acidic, Neutral, Alkaline
Soil type - Clay, Loam, Well drained
Water requirements - Average Water
Landscape uses - Feature Plant, Shade Trees, Street Trees
Bloom season - Summer
Leaf / Flower color - Green / White
Seeds can be soaked and sown with no pretreatment (skip step 2 ), 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.