Thursday, November 19, 2015

Do you get confused with all the small leaf coprosmas?

Maxine Fraser did a bit of research and compiled this report that may help you.
On 3rd July 2011, there was a short workshop at Tamahere Nursery pointing out the conditions for these shrubs commonly used in Waikato gully restoration.  Plants which prefer the wettest sites feature first, followed by those that prefer less wet areas.
                                 Berry colour                                 Notes
C. tenuicaulia           Black        Very similar to C.areolate, but with tuft at stipule.

C. propinqua            Dark blue/flecked              Freely hybridises with C.robusta
C. rotundifolia           Orange/red
C. rigida                    White/yellow/orange
C.areolata                Dark purple
C. spathulata            Orange/dark red/black.         Very similar to C. areolate (white berries and fruits only when large tree).
C. rhamnoides           Dark red.
Following reading Small Leaved Shrubs of New Zealand (Wilson H., and Galloway, T, 1993), consulting the databases of New Zealand Plant Conservation Network and the Waikato Regional Council’s What to plant in Waikato Wetlands as well as my observation of plants in the wild, I have concluded that tenuicaulia is ‘the’ swamp coprosma (to which it is often referred), so I would plant this at the wettest end of list.  tenuicaulis and propinqua prefer boggy, low-fertile and poorly-drained sites.

C. rhamnoides is at the driest end of the list but does not like dry conditions, just less wet and free-draining.

Another study from Waikato University stated that these shrubs having separate male and female plants (dioecious), should be planted no further than seven (7) metres apart to ensure optimal wind pollination.

A reminder that to enlarge any photo in this blog just click on it.

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