Planting dates are usually chosen based on the time of scheduled planter.The optimum age in days after transplanting seedlings is: eggplant and pepper - 60-65, tall tomato - 55-60, a short - 40-50, cucumber, zucchini and squash - 20-25 days. However, we must remember that a lot of extra time required for seed germination. This is especially true of crops such as pepper and celery (two weeks), onions (12 days), eggplant and tomato (10 days). Besides, celery longer growing season. So there are lots of things that have to be kept in mind when sowing seeds.
So, if there is a desire to get an early white cabbage, it is advisable to sow the seeds for seedlings in late January - early February. The reason is that the age of the seedlings before transplanting into the ground should be 55-65 days.
During this period, it makes sense to do and celery root, but the onions, peppers, tomatoes and eggplant is better to sow in March, well after all the pumpkin in the middle of April. Then the seedlings will be ready in time.
Note
In order to prepare for sowing the seeds of cucumbers and melons, they can be hung in a gauze bag near the furnace or heating the battery. For two to three months before planting them slowly warm up, gain the necessary energy growth.
This method is "old-world", but proved its worth.
