Asian greens will tolerate hot weather better then mesclun mix. Mizuna, Tatsoi, Hon Tsai Tai, red and green mustard, Shiso, Shungiku, etc, all make excellent summer crops as " cut and come again " greens, also great for braising greens.

Lettuces tend to bolt during hot weather.

You can keep kale plants alive for 2-4 years by heavily mulching them over the winter( If you live in a cold zone )

You can make your own tomato hybrids by collecting pollen from one plant with a paintbrush, and painting it into another plant's flowers. The fruit that sets from those buds will bear your hybrid seeds.

If you're crossing f1 hybrids ( first generation crosses and not heirlooms ) the f1 cross you make will be stronger then the two parents in the first year, called " hybrid vigor " and subsequently weaker each year after unless crossing is done yearly to maintain genetic stability.

When garlic " pigtails " at the top, snap the top off ( it will snap like asparagus ) and stir fry, delicious and a delicacy in some areas, it will also make your garlic bulbs much larger.