In these regions it is far too cold to sow tomatoes directly in the bed. In the protected atmosphere on the windowsill, however, cultivation works very well. You can find out how long the germination period is and what factors influence it here.
How long does it take for tomatoes to germinate?
The germination period of tomatoes is around 10 to 14 days under optimal conditions, such as constant temperatures of 20 to 24 degrees Celsius and a warm, humid microclimate. However, for historic tomato varieties, the germination time can be 4 to 6 weeks.
Optimal conditions for rapid germination
Tomato plants come from the warm regions of South America. Their preference for summer temperatures is already apparent during sowing. Anyone who manages to provide tomato seeds with a warm, humid microclimate at a constant 20 to 24 degrees Celsius can look forward to the first seedlings after 10 to 14 days. For every degree below the ideal germination temperature, the germination time is extended by several days, if not weeks.
Correct sowing promotes germination
Although the degree of heat is the pivotal point for the duration of germination, the following factors still have a certain positive influence on the process.
- use fresh tomato seeds if possible
- soak overnight in warm water, chamomile or garlic tea
- Sterilize the growing substrate in the oven or microwave before use
- only cover the seeds minimally with soil to ensure light germination
- Never expose seed containers to full midday sun
- keep the seeds constantly moist
- ideally water from below without causing waterlogging
In addition, the timing of growing tomato plants plays a role in the successful result. If a heated greenhouse is available, the ideal start date is the last week of February. In the room on the windowsill, a start from mid-March is considered.
Old tomato varieties require a higher germination temperature
They are trendy, the historic tomato varieties. Convincing advantages, such as higher resistance to diseases and aromatic taste, speak for many classics. Please note that the germination period is comparatively long, 4 to 6 weeks, at temperatures of 20 to 24 degrees Celsius. In this exceptional case it is permitted to increase the heat to a maximum of 30 degrees.
Information about wild tomatoes has been compiled for you in this article.
Tips & Tricks
A heated indoor greenhouse (€59.00 on Amazon) is a very expensive investment. Savvy hobby gardeners use a simple mini greenhouse and place it on an inexpensive heating mat.
