yes, you need 50 level 10 fire based dragons, you can sell them to make more space for new dragons, it'll keep track
Dragonvale shrine guide and lvl 15 dragons Since it wasn't very easy to understand, I posted a guide on how Dragonvale Shrines work. The first dragonvale shrine, Plant, is pretty quick to complete but the others will take some time and certainly money. Once you hit your 50 lvl 10 Plant dragon quota, you'll be able to level your Plant dragons (or any hybrid plant dragons) to level 15 though it is a very costly thing to do. It's also noteworthy that leveling them past level 10 don't give them amazing gold gains, its very linear to the gains you were seeing before. If you'd like to see my two level 15 dragons and their lil elemental globes you can add me on game center: neggie77 Otherwise, here's the shrine stuffs: http://dragonvale.iphoneipadgaming.com/guides/default/Dragonvale+Shrines have fun, enjoy the update