I grow some daylilies produced by tissue culture from two different sources here in Europe - and the experience with the plants is over all quite good. A friend of mine is working in this field - he told me that it all depends on quality control during the whole production process. The plants can be created by tissue culture but then you have to grow them in the field for at least one season to check if the flower quality is like it should be - there are always some plants to cull, even if the process is carefully done.
The remaining ones can be sold and will satisfy the customers - not only because of their quality but also because of their quite reasonable prices.
My own experience is that some of this plants (I have about twenty here) do grow slower than expected for the first years - finally they all made it up to now.
