Please choose the correct ending to complete the given sentence: Food and Entertaining: [header] How to grow rhubarb [title] Determine whether you're in the right growing zone. [step] Rhubarb is a cool-season plant that requires temperatures that drop below 40 ° f (4 ° c) in order to stimulate growth. The northern states in the us as well as canada are good places to grow rhubarb.

Ending1: Check your growing zone to find out if you can grow rhubarb in the climate where you live. [substeps] Rhubarb grows best in usda hardiness zones 3-8. Ending2: The climate is drier in those places and you can technically harvest, but it will grow faster. [substeps] Rhubarb grows best in areas with wide open spaces that are roughly 50 square feet (and even less room for other plants). Ending3: Keep in mind that rhubarb can get too heavy if you plant it in the ground (or in a pot). [substeps] You may want to plant it in your ground, rather than simply dig a hole in the ground where it will be active. Ending4: However, if you live in a cooler climate and want to grow your rhubarb, you will need to make sure it's 100% nitrogen-rich. [substeps] Rhubarb is best grown in regions where temperatures in winter are relatively low.

Answer format: ending1/ending2/ending3/ending4