In the local regions it is far too cold to sow tomatoes directly in the bed. On the other hand, in a protected environment on the windowsill, the cultivation succeeds very well. You can find out here how long it takes to germinate and which factors have an influence.
Optimum conditions for rapid germination
Tomato plants come from the warm regions of South America. Their preference for summer temperatures is already evident during sowing. Anyone who manages to offer tomato seeds a warm, humid microclimate at a constant 20 to 24 degrees Celsius can look forward to the first seedlings after 10 to 14 days. With every degree below the ideal germination temperature, the germination period increases by several days, if not weeks.
Proper sowing promotes germination
Although the degree of heat is considered the pivotal point for the germination time, 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 growth substrate in the oven or microwave before use
- cover the seeds only minimally with soil as light germinators
- Never expose seed containers to blazing midday sun
- keep the seed constantly moist
- ideally water from below without causing waterlogging
In addition, the timing of cultivating tomato plants plays a role in the successful result. If a heated greenhouse is available, the last week of February is considered the ideal starting date. In the room on the window sill, a start from mid-March comes into consideration.
Old tomato varieties require a higher germination temperature
They are trendy, the historic tomato varieties. Convincing advantages, such as higher resistance to diseases and an aromatic taste, speak for many classics. A comparatively long germination period of 4 to 6 weeks at temperatures of 20 to 24 degrees Celsius should be taken into account. In this exceptional case, it is permitted to increase the heat to a maximum of 30 degrees.
tips and tricks
A heated indoor greenhouse is a very expensive investment. Budget gardeners use a simple mini greenhouse and place it on an inexpensive heating mat.