Catalpa Bignonioides - Seeds and Germination
These seeds have no special problems on its germination.
These seeds don't have a hard skin, so they don't need any previous treatment.
We can help the seeds sprouting by putting the seeds in warm water the night before to sowing them.
The ideal substrate is a mixture of sand and black peat in equal parts.
Mix and water it well. Drain the mixture, pressing to expel all the water.
The soil has to be wet but no waterlogged.
Fill with the soil the container chosen to sow the seeds
Put the seeds on the substrate, leaving two cm between them.
Cover with a very thin layer of soil.
Spray them with warm water.
The seeds may take 2-3 month to germinate under perfect conditions.
For all that time we have to keep constant moisture and temperature.
In order to improve germination, the temperature should be around 21-25ºC.
You also have to put the seeds in a sunny place.