Light after flowering for 3 weeks

After my auto flower have already started budding for 3 weeks can I put the lights back on for 18 hours?

Welcome to the forum.

Yes, autos don’t care about the light cycle and it’s actually a good idea to do so to provide as much DLI to the plant as possible. More hours = higher DLI at the same light intensity.

Thank you so much

Welcome to the community

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