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Colorado Gardener Calendar

High Plains Environmental Center - Native Plant Sale



Now-Mon, Sept 4
Butterflies at Chatfield Farms

9-3 daily. Hundreds of butterflies in a one-of-a-kind butterfly house; included with admission. 8500 W Deer Creek Canyon Rd, Littleton 80128; 720-865-3500. Details:

Fri-Sun, Sept 15-Oct 29
Corn Maze at Chatfield Farms

9-5; Tickets available late August; advanced sales for members; no onsite ticket sales. DBG Chatfield Farms, 8500 W Deer Creek Canyon Rd, Littleton, 80212.; 720-865-3500.


Sat, Sept 16
Annual Niwot Honeybee Harvest Festival

10-4; Speakers, music, vendors & family fun. Downtown Niwot, 2nd Ave & Cottonwood Square. Info:


Sat, Sept 16
Plains Conservation Center Agriculture Festival

10-4. Wagon rides, 1880s homestead village & tipi camp tours. $5 per vehicle, buy tix in advance through DBG,

21901 E. Hampden Ave., Aurora, 80013. 303-326-8380.


Sat, Sept 16
Historic Welby Days

9-2. Free. Harvest-themed farmers market, fall flowers & shrubs, car & tractor show & kids’ activities. Rotella Park, 1824 Coronado Pkwy N, Denver.


Fri, Sept 22
CO Natural Heritage Program Annual Rare Plant Symposium (in conjunction with the CoNPS Annual Conference).

Adams State University, McDaniels Hall, Alamosa, 81101. Info at


Sat-Sun, Sept 23-24
CO Native Plant Society Conference

Flora of the San Luis Valley: History, Culture & Science. Sat. 9-5; Adams State, Richardson Hall, 208 Edgemont Blvd, Alamosa, 81101. Sun. field trips vary. Visit to register; $30-$75 in-person or virtual options.


Thurs, Sept 26
Denver Urban Garden’s Annual Gather ‘Round Gala

6-9:30pm. Tix start at $150/person. ReelWorks, 1399 35th St, Denver. Info:


Sat, Sept 30
Jared’s Nursery Annual Giant Pumpkin Festival

10-4; contests, food trucks, kids’ activities & giant pumpkin drop. Free admission & parking. 10500 W Bowles Ave, Littleton, 80127.
Details: 303-979-6022.


Sat, Sept 30-Sun, Oct 29
Harlequin’s Gardens Holiday Gift Market

See e-newsletter or for details.
4795 N. 26th St, Boulder. 303-939-9403.


Wed, Oct 4
Growing Gardens Community Harvest Festival

3:30-6:30. Free (suggested donation of $5-25 per family). Rain date Oct. 11. Hawthorn Farm, 1630 Hawthorn Ave., Boulder.

Info:, 303-443-9952.

Fri-Sat, Oct 6-8
Pumpkin Festival at Chatfield Farms

9-4. Ticket sales start late Aug. No onsite ticket sales. Details at; 720-865-3500; Chatfield Farms, 8500 W Deer Creek Canyon Rd, Littleton, 80212.


Fri, Oct 6
High Plains Arboretum Fall Foliage Tour

1-2:30. $10. Cheyenne, WY. Call the Cheyenne Botanic Gardens for details & directions. 307-637-6458.


Sat, Oct 7
Nick’s Garden Center Annual Giant Pumpkin Contest

11-2; see for details.

2001 S. Chambers Rd, Aurora, 80014. 303-696-6657.


Sat, Oct 14
Fort Collins Nursery Annual Giant Pumpkin Weigh-off & Fall Jamboree

10-3. Details at, 970-482-1984;
2121 E. Mulberry, Fort Collins, 80524.

Sat & Sun, Oct 14 & 15
Montrose Botanic Gardens' Scarecrow Festival

10-4. Free and open to the public. Kids' activities and Fall crafts plus a Silent Auction featuring creative scarecrows and other Fall decor.
Details at

Thurs, Oct 19-Sun, Oct 22
The Gardens on Spring Creek Annual Pumpkins on Parade

6-9pm nightly. Features hundreds of pumpkins & gourds. Admission $5-10; children 4 & under free. 2145 Centre Ave, Fort Collins, 80526. Info: or 970-416-2486.

Sat, Oct 21
Smith Farms Giant Pumpkin Festival

10-4. Weigh-off, farmers market & other fun.
8310 Blue Gill Dr., Peyton, 80831. Info: 719-469-2780.

Cheyenne Botanic Gardens

11/11: Bonsai Collection at the National Arboretum Presentation 10-11:30. Free. Details:, 307-637-6458.
710 S. Lions Park Dr, Cheyenne, WY 82001


CO Water Garden Society

9/14: Lauritzen Gardens of Omaha

10/5: Photo Contest & Tips from Scott Dressel Martin

6-7pm potlucks; 7pm talks.
Denver Botanic Gardens, 1007 York St., Denver.

Colorado Native Plant Society webinars, workshops & field trips


CSU Extension Free Online Webinars

Online classes at noon. 9/13: STEP into these Trees
10/11: Plants that will Kill You!
11/8: A Gardening Year in Review
12/13: Fresh Gardening Myths

Register at:


Denver Botanic Gardens

Check website for class listings & fees. 1007 York St, Denver.
Register: 720-865-3500.

Denver Rose Society

9/14: Native Pollinators & Native Plants. 7-9pm

10/21: Putting Your Roses to Bed. 7-9pm

DBG, Freyer-Newman Center, 1007 York St., Denver

Denver Urban Gardens

Gardening, composting & preserving workshops Aug-Oct at
1031 33rd Ave., Denver, 303-292-9900

Echter’s Garden Center

9/2: Landscaping Your CO Garden, 10-11am.

Planting for Success, 2-3pm.

9/3: Indoor Plants,2-3pm.

9/9: Composting & Soil Improvement, 10-11am.

Fall Gardening, 2-3pm.

9/16: Harvesting & Preserving Herbs,10-11am.

Planting Fall Bulbs, 2-3pm.

9/17: Fall Container Gardens, 2-3pm.

9/23: Winterize Your Lawn

Free classes. See for Oct classes & updates.
5150 Garrison St, Arvada, 80002; 303-424-7979

Harlequin’s Gardens Sustainable Nursery

8/19 & 9/16: Walk About with Gary Meis, 10-12

9/10: Pruning for Strength & Beauty with Mikl Brawner, 1-2:30

9/17: Low Tech Greenhouse Design & Operation with M. Brawner, 1-2:30

10/21: Winter-sowing Cold Hardy Native Flowers with Alex Bruce, 1-2:30

$22 each. Registration required:
795 N. 26th St, Boulder. 303-939-9403.

High Plains Environmental Center

See for classes, trail & bird walks. 970-622-9676.

Phelan Gardens

9/9: Growing Great Garlic,10-11:30

$12.50 each. Details:, 719-574-8058.
4955 Austin Bluffs Parkway, Colo. Springs 80918.

Tagawa Gardens

Sign up for the newsletter to see events. 303-690-4722.

The Windsor Gardener (& Brewery)

9/16 Tipsy Terrariums. Create your own glass jar terrarium while sipping on a beverage from High Hops or The Heart. $70/person includes a terrarium, 3 plants, decorative moss, hands on help, soil etc. & 1 select drink.

10/7 Suds, Seltzers and Succulents. Our most popular class is back! Learn all about growing succulents indoors, then plant a mixed succulent pot to take home while enjoying a beverage. $50 includes terracotta pot, 4 plants, hands on help, and a select beverage.

Attendees must be 21+ for both. or 970-686-9771


Sat-Mon, Aug 26-Sept 4
Fort Collins Nursery Yard Sale

9-5 daily; trees, shrubs, perennials & houseplants.
Details at, 970-482-1984
2121 E. Mulberry, Fort Collins, 80524.

Tues, Aug 29-Sun, Oct 29
Harlequin’s Gardens Fall Plant Sale

See e-newsletter or for details.

4795 N. 26th St, Boulder. 303-939-9403.


Sat-Sun, Sept 2-3
Rocky Mt Bonsai Society Bonsai & Suiseki Exhibition

Over 100 specimen bonsai & suiseki on display. Sat, 9am-7pm; Sun, 9-3. DBG, 1007 York St, Denver, 80206. Info at


Sat, Sept 16
A Walk Among the Roses,
Riverwalk Rose Society Rose Show

8-5. Tabor Lutheran Church, 102 E. Orman Ave, Pueblo.

Fri-Sat, Sept 22-23
DBG Fall Plant & Bulb Sale

8-5. Preview party on Thurs, Sept 21; tix on sale late Aug.
Details at, 720-865-3500.
1007 York Street, Denver 80206


Sat, Sept 30
Cheyenne Bonsai Show

Details & registration at, 307-637-6458.
710 S. Lions Park Dr, Cheyenne, WY 82001

Sat, Sept 30
Rocky Mountain African Violet Council Plant Sale:

African Violet, Streptocarpus & other gesneriads for sale. 9-1 at Tagawa Garden Center, 7711 S. Parker Rd, Centennial, 80016.

Saturday, Nov 4
Denver Native Seed Swap

Free to the public. 10am-1pm
The Table Public House, 2190 S Platte River Dr, Denver, CO, 80223

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