The results are interesting and you don't need to use liquid nitrogen to check what happens. You can just put a banana in a home freezer and leave it there for at least 24 hours to be sure that it is completely frozen. Take it out and check what happens as it warms up.
In some parts of the country, spring is the best time to plant alfalfa. In others, it can be done successfully in late summer and early fall. It needs six to eight weeks of growing time before the first frost so it comes back with gusto in the spring. {C}.
While broccoli can be directly sown in the garden, most seed providers such as Heirloom Seeds recommend starting seeds indoors to prevent cold temperatures from killing seeds. Sow seeds five to six weeks before your area's last frost, usually during March or April.