Yea! When I got my conquest I used the Ice Flower Seeds together.
Another detail that you should know is that you do not need to wait for the event in June as it is possible to get flowers without using seeds to accomplish this achievement. I will leave an answer with details if you are interested in doing it as soon as possible.
Is Flower Month the only chance to receive flowers? - TibiaQA
I'll leave the answer to another question with a tip that I found interesting if you don't have many seeds.
(Hint: you can reuse pots by leaving the flower in your wither and then finally watering again.)Como obter conquistas "Green Thumb" - TibiaQA
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