It so happens I have to hand a copy of the (quite) new book by Kenneth N. E. Cox and Raoul Curtis-Machin : Garden Plants for Scotland ( ISBN 978-0-7112-2675-3 Published by Frances Lincoln Ltd.)
This handy book has been written with the intent of showing which plants are likely to thrive in a Scottish Garden and gives much useful info, such as the discovered hardiness of plants/cultivars, to allow gardeners in Scotland to choose hardy plants and good varieties to suit our climate...
So, I noly grow a couple Phygelius, capensis types, no idea of cultivar names, so I consulted this book to see what the authors ( who took advice from a great many experienced gardeners and nurserymen from all over Scotland) have to say about these plants.... I will give thier description of the hardiness rating given to the plants and you will likely be able to extrapolate that info to have some relevance to Nova Scotia, as regards temperatures etc.......
so: the book rates Phygelius as being of H3...."equivalent to a USDA rating of 7b.
Min. temp degrees F +5 to +10 F and Min. Temp degrees C -12.3 C to -14.9C Hardy in a shetered site in most of coastal eastern and northern Scotland, N. Edinburgh, mildest parts of Forth and Tay valleys and whole of south and west coasts. Damaage may occur from early or late frosts. Plants may suffer from winter wet, or unripened wood, especially in the far north."
It is suggested that the plants need full sun, in a warm sheltered site in a well-drained soil.
I would agree with that. Some winters can leave them looking a bit scruffy here, within two miles of the cold, grey North Sea but they can usually be cut back to tidy them up and new growth tends to be good.
I have a red, a pink and a yellow..... very scientific! Sorry!
But...... the book suggests the following species and cultivars.........
P. aequalis and some hybrids and named forms of it: Somerford Funfair Series, 'Coral', 'Cream', 'Wine', etc.
'New Sensation' 'Trewidden Pink' 'Yellow Trumpet'.
P. capensis; P. x rectus. 'African Queen' 'Candy Swirl' 'Cherry Swirl' 'Devil's Tears' 'Ivory Twist' 'Moonraker' 'Salmon's Leap' and 'Winchester Fanfare'
So that is the combined opinion of a whole bunch of Scottish gardeners! Hope it may help a little!