Your climate allows you to grow a vast array of temperate plants which would be impossible in a climate with warm summers. All the moisture loving Southern Hemisphere plants...... and you are probably on acid soil? You may not be able to grow bulbs which require a hot summer baking because that simply will not happen. But if you go through the WIKI you will come across a lot of bulbs which grow in constantly moist conditions. There are gladiolus species which grow in waterfalls, Wachendorfia and Wurmbea grow in water, many Watsonia like a moist root run all year, so do Crocosmia. You do not state how much or how often you get frost, that may in fact be a more limiting factor than rain. If you have plenty of water: create a large water feature with Iris, Lysichiton, Aponogeton (but the last two may become very invasive) Gunnera may be possible, what about Hedychium? Bletilla? Maybe the more robust Crinum species and hybrids would like your conditions, Hemerocallis for sure. Agapanthus can take a lot of moisture. I would also try the tropical tuberous waterlilies because you will have high light levels during summer.
My general recommendation is to start from seed as many different bulbs you can get hold of. This way they start under your given conditions. You will be surprised how easy this is. You will have failures, of course, but those which thrive are the rewards. And seed is not expensive. I can see a lush tropical looking very green garden.......and I hope your heart is not leaning towards a desert garden.
Happy experimenting!
Uli
My general recommendation is to start from seed as many different bulbs you can get hold of. This way they start under your given conditions. You will be surprised how easy this is. You will have failures, of course, but those which thrive are the rewards. And seed is not expensive. I can see a lush tropical looking very green garden.......and I hope your heart is not leaning towards a desert garden.
Happy experimenting!
Uli