Without plants to generate oxygen, humans would have to retrieve it from scuba tanks and the minty breath of local supermen. Keep the air alive with today's Groupon to the Rhododendron Species Foundation & Botanical Garden, located on the Weyerhaeuser campus in Federal Way. Choose between the following options:

• For $4, you get one single-day general admission (up to an $8 value).
• For $25, you get a one-year family membership (a $50 value).

Spanning 22 acres of horticultural brilliance, the Rhododendron Species Foundation & Botanical Garden houses a massive collection of rhododendrons, many of which can no longer be found in the wild. With an eye on conservation, the foundation has collected more than 600 species of this firecracker-flower-sporting plant, many of which originate in the wilds of Asia, Europe, and the moon's Copernicus crater. Waves of floral fragrance energize budding botanists as they make their way through this tranquil environment, also home to ferns, heather, and perennials. Visitors can peep at tropical blossoms in the Rutherford Conservatory, high-altitude greenery in the Alpine Gardens, and lethargic Ents basking in the Himalayan blue poppies of the Meconopsis Meadow.

A one-year family membership includes unlimited admission for a household of two adults and any children under 18 and a subscription to the foundation's quarterly newsletter. A 10% discount at the gift shop and plant pavilion invites green thumbs to frolic through a range of potted flora and seeds, as well as educational nature books that explain that most plants wilt from overwatering but not loving back massages.

General admission to the Rhododendron Species Foundation & Botanical Garden is free for children under 12, military personnel, and current Weyerhaeuser employees. Those choosing the membership option must activate their membership within 30 days.