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

Our garden tours are free for our members. info [at] onrockgarden [dot] com (Contact us) for details.


Our members open their gardens to informal visits from fellow members. Join to learn more.

An easy, reliable, pretty bulb for any spring garden. Details

Fall offers optimal conditions for most perennials to get well established. Coming Sept. 10. Details


There is general acceptance and studies done on the fact that most seeds need to be kept at the ambient temperature after collecting and cleaning - at least for a few months. In some cases it even improves germination. It's called pre-conditioning. Placing seeds in the fridge early in the season will only induce them in second dormancy, or even worse. It is the natural way - fruits/seeds mature, fall on the ground and so on throughout the summer and early fall. They will only experience cold gradually from late fall to winter.


What's New!

  • Posted on March 27, 2017

    Frank Kershaw presents Garden Privacy & Security on April 19. Marion Jarvie's talk on June 17 is "Spring in the Jarvie Garden". Details.


  • Posted on March 17, 2017

    Red Lily Beetle

    The Big Bug Hunt is a new citizen science project collecting information about pest behaviour with the aim of notifying gardeners when pests are heading their way. Input from gardeners around the world will help beat garden pests more effectively and without resorting to chemicals. Report your observations through bigbughunt.com

  • Posted on February 20, 2017

    NARGS plans to create a feature to attract potential rock gardeners by posting on its website lists of plants that are easily grown and accessible. The list on NARGS will be linked to the ORG&HPS website, so that browsers can eventually become our new members. It is sometimes hard for a newbie to know where to begin: which plants are worth buying and trying to grow (with a reasonable expectation of success) and which plants are easy to find (either at local garden centers and nurseries, or online). For the plant lists to be optimally useful, users will need to be able to compare their own weather patterns and soils to those submitted by chapters around North America. Contribute your suggestions of 20 – or even more – plants along with whatever information you care to add about how you grow your plants by contacting Anna Leggatt or info [at] onrockgarden [dot] com (contact us).

  • Posted on February 16, 2017

    Crassula 'Springtime'

    Check out this updated website! You can now order succulents, begonias, pelargoniums and cannas on-line from ORG&HPS members, Derek and Jeff. www.masonhousegardens.com

  • Posted on January 29, 2017

    In 2016 Lost Horizons made many improvements in the nursery, rehabilitated the entrance gardens and extended gardens along the creek. They'll reopen in April. Check out their catalogue.

Upcoming Speakers

Plant Highlights from My Travels Around the World

Anna Leggatt

Anna has a BSc. in Botany from London University, a Diploma in Nature Interpretation from Humber College and a Diploma in Horticulture from Guelph. She is currently employed as a part time Nature Interpreter at the Kortright Centre for Conservation...

My Accidental Scree Garden

Miriam Goldberger

Long before “Sustainable” became a powerful buzzword, Miriam Goldberger began growing wildflowers. A flower farmer since 1986, Miriam is an expert in organic and sustainable gardening. She is the founder and co-owner of Wildflower Farm, a wildflower...

Plant of the Month for May, 2017

 (kor-ID-ah-liss  SOL-id-uh)

General Information:

Corydalis solida is a great spring ephemeral that brings an unusual color to the garden at this time of year. How many of our spring flowers are red, pink or purplish red? Spread them around the garden between larger plants and enjoy them while the larger plants are still sleeping. By the time they grow to any size, C. solida will have gone underground for a summer snooze.

Corydalis solida by Robert Pavlis