addvice wanted

this is my first time growing and one of my plants has almost started budding but when i checked it yesterday all the heads/tips have turned a bright yellow plant does not look sick leaves are healthy has a weak smell but still noticable not sure if plant is sick or weather or not its just a diffrent strain of bud

Someone might help you better if you could post some pictures. Because maybe in your case something is going on or perhaps it could be new growth which is lighter than your old growth.

Your plant prob needs food if your not feeding it anything these symptoms can arise. Hard without pics but just trying to help.

ph and other factors as well play a role in certain plant problems

Yea, send us some pics and we'll try to help.