In the front and back of our cabin we have Large-leaved Lupine (Lupinus polyphyllus) growing on floating stumps. I love the way beautiful stalks of purple flowers and bright green palmate leaves reflect on the lake's surface on a calm day. When that happens, it doubles our viewing pleasure.
You will find this Lupine growing predominately from Northern California through Southern British Columbia. It is much larger than the Lupine I was familiar with when I lived in Southern California. This variety can grow up to 1.5 metres tall.
Several tall sturdy stems rise from a cluster of basal leaves. Additional leaves continue up the stems in an alternating fashion. At the top, blue to purple pea-like flowers bloom. The flowers open from the bottom up, making the blooming season last a long time. When the season has passed, curved hairy pods form. As they age, they become dark and split, releasing the seeds.
This decorative log has been producing a garden of Lupine for several years now. Doesn't that make an attractive floating flower box? And it's self watering, with the roots growing down to capture the lake water on their own. -- Margy