Caught between agronomists who insisted on cleared fields and foresters who claimed any new seedlings as state property , farmers in niger had learned to avoid growing trees altogether .
He watched oat seedlings warn each other of danger by releasing jasmonate acid , and tracked the dropping of poisoned leaves by the sonoran brittlebush to ward off competition .
Published by clarkson potter , it goes on sale this month , just in time to guide gardeners interested in taking another look at all those weeds crowding out their beet and carrot seedlings .