Tweed Wonder Beans This page first published: Jun 18, 2005 · Modified: Jun 14, 2018 · by CooksInfo. Copyright © 2020 · This post may contain affiliate links · This blog generates income via ads · Tweed Wonder Beans need a long growing season; 110 to 120 days from seed. The plant tolerates some colder weather while growing. Tweed Wonder Beans are good as a green bean. When dried, the long, oblong beans inside are dark purple.