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}.
1 In zones with low moisture and rainfall, soak the seeds for 24 hours before planting.  Early crop can be planted in March/April, and late crop anytime from June to September. Successive plantings are also possible as long as the weather doesnât exceed 75 degrees F. Space plantings about 20 days apart.