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Master gardener Deborah Trickett will speak about container gardening Tuesday at 7 p.m. in the Clark Room at Town Hall, 66 Westford Road. Container gardening is considered an ideal option for those who want to grow herbs, vegetables, or other plants without working a large garden plot. During her free presentation, Trickett will discuss appropriate containers, soil mixes, and plant choices for various site conditions, and will talk about how to keep gardening environmentally friendly.