Can Seedlings Get Too Much Light?

Can seedlings get too much light? Yes, it is true that your seedlings need lots of bright light to grow healthy and strong—but they also need a period of darkness in order to thrive. In general, seedlings should receive roughly 14 to 16 hours of light a day when situated in a south-facing window.

Can you leave grow lights on 24 hours a day for seedlings?

The answer to the question is no, it is not recommended to leave your grow light 24 hours a day, because this will force plants to grow quickly. It is ideal to keep a grow light on for about 12 to 18 hours. Too much light in various growth phases can interrupt a weed plant's natural process of growth and dormancy.

Do newly planted seeds need light?

A sprouted seed is no longer a seed but a seedling, a miniature plant. The most important thing to consider and deliver is adequate plant light. Seedlings need more light than full grown plants, ideally as much as 16-18 hours a day. Once seedling emerge bring the light as close to the plants as possible.

Why is light not needed for germination?

Normally, the light form decays to the dark form after a few HOURS, but it is converted back again after a few MINUTES in the light. So, a seed on the soil surface gets enough light to keep the dark form of phytochrome low for sufficient time to prevent germination initiation.

Do basil seeds need darkness to germinate?

Do basil seeds need light to germinate? No, basil seeds do not need light in order to germinate. But you should only cover them with a thin layer of soil, and don't bury them too deep.


Related guide for Can Seedlings Get Too Much Light?


Where should seedlings be placed indoors?

A sunny window will do, but adding consistent light from supplemental fluorescent lights will give you the best results. Suspend the lights just an inch or two over the tops of the plants. Cool room temperature is best for seedlings.


How many hours should I use my grow light?

To be effective, grow lights really need to be on for at least 8-10 hours a day. This can vary up to 16 hours, depending on the conditions. That's why LED grow lights are so popular – when they have to be left on all day, it's best to use an energy efficient type! Always position a grow light above the plant.


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