paint them... dutch tape them... cover them with folio to reflect back the light... switch off the light... google them...

clear cups
how long can u use plastic cups
tevfik Reviewed by tevfik on . Germinating seeds in some plastic cups.. ..I just realized it might have been a bad idea, because the cups I used for these seeds are clear. What effect does light have on roots? Im wondering if I need to make these cups not translucent..im guessing yes. Rating: 5