The seed-starting mix should be a bit fluffier and lighter in weight than potting soil. This is because seeds need to be able to push through to the surface and you don’t want them working extra hard on this.
Not all cell trays are created equally. Grab something that features some sort of hole or slit at the bottom to allow for proper drainage. Otherwise, the roots can rot.
Tomatoes will germinate best with temperatures between 65°-85° so unless you have an area that remains this temperature consistently, we recommend getting a heat mat or two to be safe.
Within a few hours of germinating, you should provide light for your seedlings. It’s best to provide light a few inches directly above them as soon as you notice any germination.
Water is very important to new seedlings but keep in mind, overwatering is very easy to do. Try misting your seedlings to prevent overwatering.
Run a lightly blowing, oscillating fan on your plants. The breeze causes the plant to release a hormone that triggers it to thicken up its stem, making them strong and prepares them for rain and high winds when it comes time to live outside.