At harvest time, pick bottom sprouts first twisting them off or using a sharp knife. Remove all leaves below unpicked sprouts. Sprouts may be harvested well into winter and will withstand heavy frost. Avoid planting where any member of the cabbage family grew the previous year. 1
Enjoys a full sun position in your garden and remember to water moderately. Catskill is generally regarded as a hardy plant, so this plant will grow or become dormant during the winter. Catskill needs a loamy soil with a ph of 5.9 to 6.1 (weakly acidic soil).By our calculations, you should look at sowing Catskill about 21 days before your last frost date.
Breeder: Arthur White, Arkport, New York, and Joseph Harris Company, Rochester, New York. Vendor: Joseph Harris Co. Parentage: selection from private stock of Long Island Improved. Characteristics: short dwarf plant, hard sprouts closely spaced. Similar: Long Island Improved. Adaptation: eastern United States. Harris Catalog, 1941. 2
Brussels Sprouts
1 Burpee, seed packet description
2 Vegetable Cultivar Descriptions for North America
3 www.bettervegetablegardening.com/growing-brussel-sprouts.html