Yes, that can be normal depending on the context.
During flowering, the pistils (the white "hairs" of the flowers) will naturally darken and retract as they mature. However, if this is happening very early (which doesn’t seem to be your case), there could be a few causes:
Possible normal reasons:
- Some genetics start to darken pistils earlier, especially hybrids.
- Accidental pollination (if there’s any hidden male/hermaphrodite flower).
- Light environmental stress (intense light, heat, direct wind from fans).
Possible signs of a problem:
- If many pistils are darkening all at once, without the flower actually fattening up, it could indicate stress (light too close, excessive heat, nutrient deficiency/excess).
- If the pistils are drying out without the formation of new calyxes, it could be a sign of a blockage in development.
Overall, you shouldn’t worry if it’s just a few pistils darkening, as it’s part of the cycle. What you should observe is if the buds continue to form new white pistils (that shows the flowering is progressing).
Missing relevant information:
How many weeks into flowering are your plants?
How far is the light from the top?
Big hugs and good luck on this run 😁