Pacific Northwest Gardening: blue flowers, 1 by growin

growin wrote:
Wow! Now there's a list. There are a few trees: Ceanothus arboreus 'Trewithen Blue' and other cv's (need proper situation & protection), Paulownia tomentosa & kawakamii (purple but could be blue'ish on an overcast day), Sophora davidii, Vitex agnus-castus, Rhaphithamnus spinosus (more purple/blue - Heronswood intro - got one), Syringa (Lilac) and I'm sure a few others. I'm delighted with this one - Acnistus australis - which I didn't think was hardy until I saw it at UBC Botanical Gardens treated like any other shrub. I tried it and mine is coming out with great vigour now. It seems to bloom better in dry soil and more sun.