It depends on what contest like fastbuds420 Xmas yes it has to be fastbuds strains only.
The photo of the month
The grower of the month
The diary of the month
Those you can enter without fastbuds
The mars hydro and ac infinity contest you can use any photos ypu want I just suggest putting their products in photos
Some contest ypu have to have a smile on the diary to use the photos and some the photos have to be posted within a tineperiod
Pretty much each contest has ita own rules and you can find them on each page for each
It depends on the contest but the rules are listed on the contest page.
Diary of the Month can be any strain/breeder, not just Fast Buds
The Christmas Contest in Fast Buds only.
The Photo contest is any photo from a diary