Every year at the Rhubarb Festival, we are asked, “Just what is Rhubarb?” So if that is where you are starting, you have come to the right place.

Rhubarb is a very hardy perennial plant, so tenacious that it will survive from growth zone 8 to zone 3. It is part of the Buckwheat Family [Polygonaceae] of plants, the cousin of sheep sorrel and curly dock [Rumex crispus]. Garden rhubarb in the United States is Rheum rhabarbarum, one of dozens of varieties within that Genus. The roots are long, woody, and look somewhat like huge carrots. They are referred to as ‘crowns.’ Around here, the Rhubarb starts to come up in April: a red, bud-like knob of curled leaf, crowning through the soil. Then come the stalks, pushing the leaves higher into the air. The stalks can be three feet tall, colored red or green. The leaf is heart-shaped and very wide. At this point, the stems can be harvested for eating. [What can one cook with rhubarb? Several future blogs will address that, recipes included.] Please note: although those leaves look good enough to eat, they contain high amounts of the toxin Oxalic Acid. DO NOT EAT THE LEAVES.

By June, the flower stalks rise high above the leaves, carrying bunches of tiny, frothy flowers looking like cumulus clouds. Gardeners in the know are aware that these stalks must be cut down. If a Rhubarb plant blooms, then the stalks become too tough and woody to eat. This has lead to the erroneous notion that Rhubarb is available only in the Spring. No so. If you cut down the flower stalks, you can harvest the stems until September.

At the Bennington New Hampshire Rhubarb Festival, there are contests for ‘Longest Stalk’ and ‘Widest Leaf,’ as well as ‘Rhubarb Photography’ and ‘Rhubarb Flower Arrangement.’

The next installment will be posted on May 9. If you click the Follow button, all future posts will be sent straight to your inbox every month.