Plants, mankind’s greatest enemy, are finally on the ropes thanks to global warming. Teach your children how to hunt the last of these enormous nitrogen junkies by observing them in captivity with today's Groupon: for $20, you get $40 worth of plants, landscaping materials, and fish at Harb's Oasis.

Harb's Oasis allows green-thumbed customers to fortify their homes’ outdoor carpets with an array of eye-catching flora. Specializing in ponds and fountains ($300+), the shop gives landscaping consultations to personalize and beautify backyards and gardens. Invite koi and goldfish ($3.99+) to frolic in your front yard, or spruce up an aquatic garden with vibrant water lilies ($38.99). A small water bowl with a lily, a water pump, and fish ($130+) equips customers with the building blocks of an aquatic landscape while providing them with a place to dispose of their stale cereal. Harb's Oasis also houses a selection of tropical flora and plant-ready pottery.