Take the guesswork out of watering your plants. Learn about hydroponic culture: which plants to grow, what products you need, and how to set up and maintain your system. The course, sponsored by Historic New England, will take place at the Lyman Estate Greenhouses in Waltham on Friday, June 18, from 10 – 12, and the fee is $20 for Garden and Landscape members, $25 for HNE members, and $35 for nonmembers. Registration is required at www.historicnewengland.org, or call 781-891-1985.
