The Highland Lakes Master Gardener Association will hold its next Green Thumb Program June 20 from 2-3 p.m. at the Burnet County AgriLife Extension Auditorium, 607 N. Vandeveer in Burnet.“Companion Gardening” will be presented by Martelle Luedecke, a gardening expert and professional photographer. Attendees can learn the benefits of companion planting for a successful garden.T...