Fertility of conversions will nearly always be less than that of the diploid versions. That applies to both pod and pollen. The fertility of normal tetraploids is on average less than the fertility of diploids. This is a side-effect of doubling the chromosomes. Although it is not avoidable (on average) it could be alleviated with time and the passage of generations of tetraploid breeding if daylily hybridizers selected the cultivars they used as parents for increased fertility (choose parents with above average fertility).
Scapes may blast on tetraploid conversions (high amounts of water may cause the scape to break if the abundant water happens at the time the scape is rapidly elongating).
