The quoted bit was about growing conditions - ie instead of a field of only one species, combine multiple species. The species diversity helps control pests, a

The quoted bit was about growing conditions - ie instead of a field of only one species, combine multiple species. The species diversity helps control pests, and allows for a greater variety of birds etc. And is way harder to harvest. Your point was about reproduction. Sexual reproduction doesn't have to be out in the wild - it is offspring combining DNA from parents producing something a little different. It is possible to try and introduce genes to make out in the field reproduction more likely to happen, and also to work out some lab based way of reproduction. Admittedly it is way harder than making cuttings, but does bring benefits.