If you want to go aggro, cut some of your more expensive stuff. So far, your curve is pretty low, but maybe drop 2 or three of your CMC >= 4 creatures (Garruk's Packleader, Thragtusk, Trostani, Armada Worm, Giant Adephage) Ultimatley it's up to you, but I'd keep Armada over Adephage, since Armada gives you the token no matter what, and 1 Garruk and 1 Trostani are probably enough.
Moonsilver Spear isn't a great match for this deck, it costs 8 to get it going, and your other enchantments would be better, and cheaper (i.e. Collective Blessing and Cathar's Crusade are where you should be putting that mana.)
Keep in mind that your goal is to overwhelm with numbers, not survive long enough to drop a bomb. Consider ditching an Akroma's Memorial for another Growing Ranks (and just populate the crap out of your grove of the guardian tokens.)
Sundering Growth is a great removal spell if your opponents tend to have artifacts or enchantments that give you trouble. Also consider Awakening Zone, and maybe a little more ramp to help you get to the heavy-hitters faster (good choice on the Arbor Elf though.)
Also, Wayfaring Temple is a good card on paper, but I've found it underwhelming in practice. It's either too small, so I can't get it through for the populate, or end up chump blocking with it, or is big enough that I'd win the game even without it. i.e., early game, it's not enough, and late game it's irrelevant. There's a small time mid-game where it shines, but so far I've never really hit that zone, it's smaller than I thought. Again, it will play differently in your deck and against your friends, but I've been disappointed with it.
Hope that helps!