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Actually Gabriela I've not found it at all difficult. It needs established Salix spp. to grow on - in the wild it seems to prefer wet conditions on clay but here it seems to tolerate our rather thin loamy stuff well. The roots grow an inch or two below soil level and are whitish, rather like the rhizomes of Dentaria bulbifera or Dicentra formosa. It seems to take quite a lot of water from the willows if it isn't wet enough as the soil around the plant can be physically wet when all around is dry. I established mine by planting pieces of root next to willow roots in the garden. I've not seen the seed but I'm sure it is around I'll take a look at the right time.
Lathraea clandestina. This interesting parasitic plant grows on the roots of willows and produces masses of scented purple flowers in spring. It never appears in exactly the same place twice.
Robert, my understanding of collinsias is that they like a wet spring followed by dry. Is that correct?
Images from last summer in the garden … covered with snow for much of yesterday.