By aeroponics, potato inflorescences were promoted effectively, and the number of flower buds and flowers, and pollen fertility were much superior to those of plants growing in field.
These crops have been cultivated for a long time and only few cultivated varieties have spreaded to great area. The genetic resources of these crops has become more and more limited.
Horseradish is one of the advanced rare vegetables originated from Japan, where it has been cultivated for more than 400 years, it is regarded as titbit by Japanese.
So-called "blue roses" have been bred by conventional hybridization methods, but the results, such as "Blue Moon" are more accurately described as lilac in color .
They have thus been bred or cultivated, often with a production of superior strains, as with our domesticated animals, our food grains, and our potatoes.