Fall offers optimal conditions for most perennials to get well established. Coming Sept. 9. Details

info [at] onrockgarden [dot] com (Contact us) if you encounter obstacles.  Watch "What's New"  to keep up-to-date.

July's Plant of the Month is vibrant and adaptable. Read more.

At TBG on Sept. 9. Free admission. Non-members are welcome. Details.


Conditions are excellent for ripening and drying seed. Save as many kinds as you can.  Donation information for the Seedex will be found in the September and October newsletters.


WANTED - short (20 min) presentations for Members' Showcase, December to March, after the featured speaker.
Gardens, techniques, favourite plants, books, visits. Preferably some horticultural connections. Contact Anna Leggatt

What's New!

  • Posted on June 27, 2018

    Barb and Bella sent us this note: "We just returned from the west coast with some plants and wanted to alert our members who are travelling this summer within Canada by plane. We had the good fortune to spend some time with David and Wendy Sellars. David propagates alpines and offered us as many plants as we could fit in a shoe box in the bottom of a bag. He made a fine collection for us. The airline absolutely agreed that this was an acceptable hand baggage that would fit under the seat or in the overhead bins. However the security pulled our bags out and refused to allow them on the plane. We really had to scramble and were lucky to find a young man who could help us to pack them and put them through ‘oversized’ baggage. This is what we learned: Your can no longer take plants with any organic material in your hand luggage. There is a new threat that Security is screening for that is an organic material about the consistency of bath salts. So, the potting mix and top dressing on our plants mimicked this material and set off the alarms. Unless you can completely bare root your plants, they will get picked up by Security. You can pack your plants in a box and register it as a checked bag. When you check in, you can take the box to ‘oversized’ luggage where it will get a bit easier ride; it will not go into the general hold but be put in the nose of the plane. (Ours came out on its side, not upside down.)"

  • Posted on May 27, 2018

    Arie Vanspronsen, a retired nurseryman, has posted a series of photos and instructions on how to prune pines. See https://www.facebook.com/groups/740896525938734/

Upcoming Speakers

Pruning Everything!

Marion Jarvie

Marion Jarvie is a renowned plantswoman who has been gardening in Thornhill for over 30 years. She is passionate about plants and gardening and has travelled extensively to see plants and where they grow. Marion has been involved with both the...

Botanizing in Patagonia

Bella Seiden and Barbara Cooper

Barbara Bella have been gardening together in Toronto for more than 20 years. They have developed a particular interest in seeing plants in their natural habitat. Their first big trip in 2012 was to South Africa to see plants in their Spring. In...

Plant of the Month for July, 2018

 (kris-OG-oh-num  vir-jin-eeAN-um)

General Information:

Chrysogonum virginianum ‘Norman Singer’ adds great color to an early summer garden and is easy to grow. It forms a mat that is thick enough to keep out most weeds, it does not need deadheading and it is semi-evergreen, making it almost no-maintenance. The only thing you need to do is reduce the size of the clump every 2-3 years.