Up to 54 days. Considered one of the best bush beans for canning and freezing, Topcrop produces 6 to 7-inch pods that are tender and crispy, containing incredible flavor. AAS Winner. A USDA release that is widely adapted. Consistent high yields. The Top Crop bean is a variety of green bean that was developed to be more resistant to diseases, and is a winner of the All-America Selections. This low-maintenance variety can thrive in zones five to thirteen. The pods develop near the top, and reach maturity at about fifty days after planting. The beans are ideal for canning and storing.