The temperatures are sizzling, and so are the popular hair colors! Red hair is back with a vengeance, and you're more likely to see women of color with russet, scarlet, or wine-colored streaks in their hair this season. But what about women with natural hair, or for those of us who may be concerned about the damage hair dye can bring?

For us, there's henna - the flowering plant that's been used to dye everything from skin to cloth since the Bronze Age. Henna has been embraced by the natural hair community for being natural, potent, and a generally beneficial treatment for hair that needs strength, shine and color. But if you're a newbie to henna, where do you begin? There are some great online resources for anyone with questions. Here are BV's top favorites.

Curly Nikki is an amazing site for anyone with naturally kinky or coily hair. Over time this site has evolved into an invaluable resource for anyone interested in henna. You can find all the benefits, tutorials and recipes you need!

The Henna For Hair site is a complete online source for everything you need to know - from the history and science of this natural plant based dye, to warnings, and where-to-buy links. Anyone about to embark on the henna experience should download the free e-book, How To Henna Hair.

YouTube is the ultimate resource for just about anything you want to learn, and henna is no exception! You can find awesome videos by popular vloggers - hennapage, lovelyti2002, and tonidaley80 , who all have great tutorials -- and that's just the beginning. If you're looking for a special review of a henna product, this is the best place to look.

So now that you've got insight and advice on what to do with henna, where do you buy it? Many naturals prefer the Mehandi variety, which has a remarkably informative site. Lush sells a range of henna that promises stunning color and comes in shades ranging from brown to black. Each color is pressed into lovely blocks reminiscent of Russian tea. And on the indie haircare tip, there's Henna Melts by TheHairShebang on Etsy. In addition to the step-by-step melts, Hair Shebang also offers a Selah Moisture Spray that offers hydration to the thirstiest strands. You can write to request the shade you need.

Are you a henna head already? Share your tips and experiences in the comments below!