Iris leaves — If your irises showed signs of iris leaf spot last year — spotted leaves with surrounding tissue that looks water-soaked and then yellows — remove old dead leaves now to help prevent its recurrence, Ward Upham of K-State writes in this week’s Horticulture 2016 newsletter. If your irises had a bad case, spray with chlorothalonil (Bravado Fungicide, Fertilome Broad Spectrum Landscape & Garden Fungicide, Ortho Garden Disease Control, GardenTech Daconil, Bonide Fungonil, Bravo Flowable Fungicide) or myclobutanil (Immunox, Immunox Plus) starting when leaves appear in the spring, Upham says. Repeat sprays every seven to 10 days for four to six sprays, including a spreader-sticker in the spray for good coverage on the waxy leaves.
Indoor farmers market — The last indoor farmers market of the winter season is this weekend, from 8 a.m. to noon Saturday at the Extension Center at 21st and Ridge Road.
Container gardening talk — Landscaper and master gardener Peggy Griffith will be at Botanica on Wednesday to talk about choosing the right container and making plant choices that meet the gardener’s needs. The lunchtime lecture, at 12:15, is included in Botanica admission. Lunch will be for sale for $8 from 11 a.m. to 12:15.