Our new fee structure means savings for families and overseas members. Just $25. Join!

No admission fee. Non-members welcome. Details

Senna hebecarpa is a tall perennial legume native to North America. Read more

Open to ORG&HPS members. More than 1200 different kinds of seed. Details.

Anna always entertains with her knowledge and love of plants. Dec. 10. Free admission. Open to public. Details.

Jeff leads this 11 day deNure tour in Sept 2018. Presentation on Dec. 10   Details.


Once again, we'll be selling pots and trays, labels and glassine envelopes at meetings to coincide with the 2017-18 Seedex.  If enough members want GA3, Turface or seed-sowing medium, we will make arrangements to have these materials available. info [at] onrockgarden [dot] com (Contact us)

What's New!

  • Posted on October 16, 2017

    Lost Horizons is selling its new shipment of cypripediums from Germany at 10% off. All remaining nursery stock is 20% off. losthorizons.ca

  • Posted on September 12, 2017







    Toronto is developing a plan for pollinator protection. Read more.

  • Posted on August 25, 2017

    Gabriela Costea of Botany Ca explains the "whys' and "hows" of moist packing seeds. Details.

  • Posted on August 23, 2017

    Circle July 6-8, 2018 on your calendar. Talking rock gardening while visiting this special province and experiencing Newfoundland hospitality is a superb way to start your summer! Registration begins in January.   Follow details on NARGS website.

  • Posted on August 14, 2017

    This brand new attraction opens Aug 17. Six-acres with twenty-eight gardens including a Bee, Bird Butterfly Garden, an Oriental Garden, a romantic Rose Garden and the world's largest Colour Wheel Garden. Details

Upcoming Speakers

Colour in Your Garden '365'

Darren Heimbecker

Darren Heimbecker is the owner and creative force behind Whistling Gardens, Canada's newest botanical garden. Darren worked as a propagator, shipper and field manager for 18 years before setting out on his own. Darren has a passion for conifers and...

Irises of the Silk Road from the Mediterranean to China

Liz Knowles

Liz & George Knowles have been developing their garden in the Hockley Valley for over 40 years. It includes a number of perennial and woodland beds, a large grass garden and several rock gardens. Liz’s focus is currently on raised tufa beds and...

Plant of the Month for October, 2017

 (SEN-nuh hee-be-KAR-puh)

General Information:

Senna hebecarpa is rarely grown in gardens but it deserves to be used more frequently. It is a perennial that can grow to 180 cm (six  feet) and has unusual compound leaves. Both of these features make it look more like a shrub.

Senna hebecarpa: photo by Robert Pavlis

Senna hebecarpa:photo by Robert Pavlis

Common names include American senna, wild senna and the northern wild senna. It is a North American legume, that hosts nitrogen fixing bacteria in it's root...