Do Tomato Seeds Need Light to Germinate

Seeds your sow in your backyard, crack open to sprout and develop root, stem and leaves, this process commonly known as germination.

Unless given ideal circumstances, tomato seeds can germinate within 7 to 15 days. But do tomato seeds need light to germinate?

The frequency of germination for the specific container of tomato seeds is determined by the seed’s age and source. It is referred to as the seed’s resilience. The slower the rate of germination and viability of a crop, the older this is.

If your tomato seeds aren’t germinating, then either temperature is too cold or too hot. Seeds need ideal temperature to germinate. In case of tomato seeds, 10 degree C and 35 degree C is suitable for seeds to sprout. Depending on various factors, tomato plant may not do well over 27 degree C. However, the ideal temperature for seed germination of tomatoes is 29 degree C.

In colder climate, you may require planting heating pad if you require increasing the temperature.

Also Read: White Lines on Tomato Leaves

How Can You Grow the Tomato Seeds Indoor?

All the tomato seeds can be planted immediately outside, but depending on the climate, they do not have much time to mature and bear fruit. You can buy tomato transplants at the nearest garden center, and you can also launch your organic tomato plants inside using seeds & seed-starting equipment and techniques.

Tomato seeds must be begun indoors 7 to 9 weeks before the typical last frosting date in your region in the spring. It gives them enough time to mature into a stable transplant until being transplanted outside.

Start sowing tomato seed indoors in the soilless seed-starting mixture, it is typically a mixture of perlite and peat. Gardening experts recommend not to start with standard agricultural soils to grow tomato seeds, because it will retain water & can contain species toxic to young plants.

You can do this in disposable planting containers or the plantable peat containers, or recycle yogurt containers or other kitchen objects — only ensure the pots are well cleaned.

In the beginning, temperature needs to be between 21 C to 27 degree C. To assist germination process, the mixture must be humid but not cold. Seeds do not need daylight to germinate, but after germination, seeds need to be exposed to 14 or even more hours of sunlight a day.

If you’re growing plants on a windowsill, make sure they’re in a dark, sunny spot with plenty of natural light. You can use a fluorescent development light to maximize the number of hours of lighting.

It is indeed the time to begin dreaming about bringing tomato seedlings outdoors after they seem solid and stable. Tomato transplants should be planted in the garden after the last freeze period. It gives you & the tomatoes an advantage over the rest of the season. Towards being healthy, we suggest waiting a few weeks since the last freezing date to bring the tomato transplants outside.

Also Read: Black Bugs on Tomato Plant – How to Get Rid of Aphids and Flea Beetles

Do Tomatoes Need Light to Germinate?

#1 Viability of Seeds in Relation to Germination:

Tomato seeds have a longer shelf time in storage than many other seeds (for example, onions require to be bought fresh each year). All the tomato seeds have a storage life of around 5-6 years if properly stored (dry & cool).

Humidity, rather than any other factor, reduces the lifespan of preserved seeds. Check to see if the seeds have survived a winter in a cold, dry climate (like in any tightly sealed container in the freezer or refrigerator). Germination is best when stored dry at temperatures below 65 ° Fahrenheit.

A range of online gardening pages discuss how to monitor the germination of a couple of the seeds before cultivating them. And if the older tomato seedlings germinate, when they’re too shriveled and old, they might have a limited amount of food left in the endosperm, resulting in frail or/and stunted plants.

#2 Seeds Sowing Advice:

While potting the soil could be fuzzy with moisture, seeds must make better contact mostly with that soil to germinate. Until planting the seed throughout the tub or jar, drench the potting soil, lower the soil on the floor about few more levels just above the surface to disperse the surface into another jar cells, and please ensure your seed has sufficient contact also with the soil.

You can gently push all the seed further into a container with a pencil, and use the pencil & then push the soil over its seed with just enough strength to cover this up.

Fine seeds don’t require to be covered; just drive them into this soil gently. Just only a few seeds require light to germinate (now check the seed containers for which ones).

Protect the seed to such a depth of 3 times their height as a normal rule of thumb.

Also Read: How to: Growing Perpetual Spinach?

#3 Water and Germination:

Water is required for seeds for germinating, but the air should also enter the seed in addition to consume the oxygen it requires. When you dampen the potting soil with some really lukewarm water and not soak wet it. A good measure is to pinch a bagful of soaked soil and see if just several droplets of water come out instead of a waterfall.

Check the flats every day to make absolutely sure they haven’t dried out entirely. If they get too dry, use a plastic container to lightly moisten them. Peppercorns, in fact, dislike moist soil and may not germinate there.

#4 Temperature and timing:

Soil moisture has a big impact on how long it takes the seeds to germinate.  Unless you retain the soil moisture about 80 degrees F, tomato seedlings need to germinate about 6-7 days.  Peppers take a bit longer to mature when they are grown at elevated temperatures (8-9 days at 85 degrees F). Keep in mind that this is the temperature of the soil, not the temperature of the air.

Speeding it up: You generally get germination faster than the regular charts expect through using 120-watt light tubes to place lower heat underneath my flats.

Also Read: Why My Snake Plant is Dying?

#5 Germination Techniques for Complicated Seeds

Soak the seeds first: Washing seeds in hot water nighttime before plantation aids germination by softening the seed cover. Pre-soaking is beneficial to many seeds, even though it is not specified in the seed germination phase. Tomato seeds aren’t normally pre-soaked, but sweet peas, parsley, and nasturtium seeds are often pre-soaked.

Seeds that terrify: The method of physically destroying the seed coating, normally by rubbing it with the sandpaper but instead soaking this in water, is referred to as this. Many seeds (such as those from woody plants throughout the family Leguminosae) have become so hard & well-protected that the seeds are unable to crack across it on their own. Scarification isn’t essential for tomato and pepper plants, but it is recommended for larger seeds with rough seed coatings.

Also Read: Why Is My Orchid Stem Turning Yellow?

Should You Germinate Tomatoes in a Sunny Window?

Tomato Seed Germination

Seeds do not require sunlight to germinate, so that you can ripen them anywhere, including inside the dark cabinet. To begin growing tomato seeds in the trays, sterilize a seed table by soaking it in the solution of 2 cups bleach & 9 cups of water for about ten minutes. Cover the tray with the seed starting blend that includes manure, which can be found at garden stores, after thoroughly rinsing and drying it.

Load within about 1/6 inch of the lip, then gently press the soil down to clear any air pockets. Water the mixture until it is moist but not watery all these ways around. Plant your seeds by digging the holes in every tray cells 1/4-inch deeper into the soil with your finger. Fill each hole of a single seed as well as enough soil to make it level.

Warming the Seeds

The soil must be maintained between 80 & 90 degrees F for the seeds to germinate. You should put them in a heated spot in the houses or even on a heating pad. A heating pad maintains a temperature of around 70 ° Fahrenheit in the soil. Seeds will germinate in 7 to 10 days on average. Keeping the soil moist as you prepare for all the seeds to start growing. Check the top 1/3 inch with your finger and see if it’s dry; if it is, apply sufficient water to thicken the soil. Do not really overwater the plants. Seeds that are wet rot and do not germinate.

Seeds Need Proper Sunlight

It’s also simple to determine the ideal tomato germination frequency. Seedlings expect temperatures about 65 degrees Fahrenheit until they have sprouted. The tomato seeds can be grown in a north-facing window, but since winter light is not as strong as summer lights, they can grow through spindly, poor seedlings if only provided natural sunlight. We clarify that supplying direct sunlight for an estimated 3 to 4 hours per day, with a maximum of Sixteen to Eighteen hours of sunlight a day, would improve seedlings.

Place freshly bloomed seeds underneath two 30-watt fluorescent tubes, hanging four inches just above plants, or another type of growing sunlight. Incandescent bulbs are scorch and hot and trees, so avoid them. Change the bulbs onward as the plants rise. Plants require darkness as well, so switching off the lights every evening. Seedlings should not be grown on a heat pad, and they should be watered as soon as the amid ongoing dries out. Till the seeds are grafted outdoors, no additional fertilizer is required.

Gangly Seedlings Implanting

Don’t give up if you try cultivating tomato plants in a sunny spot as well as the plants grow leggy & thin. Simply plant them lower in the dirt than usual, at a 45 ° angle, with just the upper 2 to 3 pairs of leaves protruding. Strip the outer branches from the tomato plant stem before cultivation. So that the ground is even, surround the seeds. Water well, and fresh roots can form all along the stem where even the leaves were cut over time, resulting in a strong, robust plant.


Get off to a positive start, tomato seeds (Solanum Lycopersicum) require a lot of sunlight. While they can be grown on a sunny windowsill, many houses do not have such a spot.

However, not all plants can obtain maximum exposure to sunlight through windows, so ambient light, such as fluorescents, is preferable. When used properly and the tomato seeds are given basic treatment, both regular standard fluorescent lights & specially made develop bulbs perform well.