Researchers use only the American cockroach (Perplaneta americana) because it is bigger and hardier
than most other species.
Senior High School, sought to develop hardier
There is an unusual golden form of bay, which we grow in the greenhouse for protection - its leaves are brightest in spring and it is said to be a bit hardier
, though I haven't yet risked one outside
The process includes resurrecting antique plant varieties and crossing them with hardier
Cosmos atrosanguineus is a perennial, hardier
but not totally hardy, with velvety chocolate-maroon flowers - chocolate-scented, too - from mid-summer to autumn on relaxed 45cm (18in) stems that lean casually on to other plants or over the edges of paths.
This could mean that a whole population could have been preconditioned by the stress of the earthquake; in other words, the stress could have made them hardier
and more resilient.
Maintaining the collection is crucial not only because it helps preserve the global diversity of plant species, says Shands, but also because it represents a huge reservoir of genetic traits that breeders can tap to produce hardier
crop strains with higher yields.
The pool, she says, is for hardier
souls because it is not heated.
With discrimination against left-handers now less prevalent, he contends, lefties may prove hardier
Meanwhile, the DFG hatcheries continue work on breeding a hardier
German brown that is easier to raise once they are beyond the two-year spawning cycle.
A new, speedy device that measures a plant's metabolic rate may improve on today's time-consuming methods for developing hardier
Researchers today are using the latest in computer science, biotechnology and genetics to develop hardier
varieties and improve storage methods -- modern efforts to make an already important plant even better.