Garden Calendar

Old Garden Rose Sale

May 20: Check out the 19th annual Own-Root and Old Garden Rose Sale featuring more than 300 hard-to-find, winter-tolerant, own-root roses, including hybrid tea roses and hardy, old garden roses. 7:30 a.m.-3 p.m. Bloomapalooza

May 20: Enjoy a variety of fun gardenrelated events at Bloomapalooza, including a seed toss, scavenger hunt, plant petting zoo, garden safari, butterfly encounter, ladybug release and hands-on gardening. 9 a.m. to 5 p.m. $11 (general), $9 (Westminster residents), $9 (seniors ages 65 and older), $7 (children ages 2-12), free (children ages 2 and younger).

Koi Auction May 20:

Purchase genuine Japanese koi fish perfect for specialty water gardens and backyard ponds during the Rocky Mountain Koi Club Annual Auction. 10 a.m.-noon. $5 (per auction number). Rocky Mountain Herb Society May 20: Get amazing plants at the Rocky Mountain Herb Society of America and Front Range Organic Gardeners plant sale. 9 a.m.-1 p.m. Free.

Denver Botanic Gardens

May 25: Alpine Rock Garden Tour. 4:15 p.m. or 5:15 p.m. $12, $10 per member. Denver Botanic Gardens, Chatfield Farms

May 26: Check out more than 50 native butterflies and rare plants. 9 a.m.-4 p.m. $4 (per adult and child), $2 (per adult and child member).

Denver Botanic Gardens

May 19: Beginners Farmer Workshop,

9 a.m.-3 p.m., $20; Native Pollinators Workshop, 9 a.m.-1 p.m., $46, $42 (per member).