Re: Can't buy health seeker, only packets

Most Arena seedium plants require 250 seed packets to unlock and Health Seeker is one of them.

You have purchased 150 seed packets, you are still 100 packets short. 

IF you really want Health Seeker, then I suggest you either purchase more seed packets with gems (from the middle image) or earn them from quests (if there are any available).  

Once you have acquired 250 seed packets, you can then unlock the plant.

Hope this helps.