Preheat oven to 375°. To prepare the carrots, cut the greens from the bunch, leaving about a ½ to 1-inch stem. Scrub carrots under the faucet to remove dirt. Slice carrots in half lengthwise and lay in a single layer on a baking sheet. Drizzle with olive oil and salt as desired. For the garlic, cut the bottom head of the head of garlic to expose the cloves. Drizzle with 1-2 tsp of olive oil and wrap in aluminum foil. Roast carrots until tender, about 30-40 minutes and allow garlic to roast for 40 minutes total.