I would expect the once the maximum (50 Bud’uh Boom seeds) has been earned by watching ads, it will not be available until the next Bud’uh Boom POTW event.
In orther words, without 100% certainty, I am expecting the ads for seeds offer will be available once the new event starts, at least, that was what happened with other Arena (seedium) plants in past.
Table below lists availble Bud’uh Boom seeds starting from Nov 17 to Nov 24
With thanks to our friend, Euphoric-Seaweed from subreddit for providing the data
Seeds | Cost | Limit | Restriction |
250 | 500 gems | 1 | Not_new_players, Gem_Balance_Above_100 |
50 | 125 gems | 4 | Not_new_players |
10 | 25 gems | 5 | Not_new_players, Gem_Balance_Below_100 |
25 | 12,500 coins | 1 | Not_new_players, Coin_Balance_Above_5k |
10 | 5,000 coins | 5 | Not_new_players |
1 | Ad | 50 | Not_new_players |