If you are able to help simply show up on a weekday and ask to to speak to Para, who will give instructions. On weekends, look for other volunteers busy dead heading rhodos in the bushes.
As well other volunteers are busy on other projects in the Gardens, reports David Culham:
The Waterfront Trail construction is underway. The central rose bed is progressing slowly and with a great deal of sweat. Rob has donated all the roses but also the great amount of time in planning out the colour, scent, and the timeliness of bloom. Our expectation is that the roses will add to the colour throughout the summer and help define a Garden and not a Park.
Ferns have been donated and planted along the Tecumseh Creek by volunteers. A mornings dig for wild flowers (May Apple) succeeded and the transplanting occurred by volunteers. Weeding and shrub trimming is underway by volunteers. Para and staff are undertaking further Rhodo plantings at the moment especially in places with previous loses.
UPDATE: Thanks to a large group of spent bloom pickers, much of the dead heading is now done. BUT -- there's always some weeding help needed, so do drop by and pull a few!
More pictures of Rhododendron Gardens see this post