Brussel Sprout Kitchen Garden PackagingBrussel Sprout plants are part of the cabbage family, and are very hardy plants and will survive through the winter. Exposure to cold weather helps them become full of taste. When should you plant Brussels Sprouts seed? The sprout seeds need to be sown into a seedbed frame at the depth of 13mm during March or early April When the plants are large enough to handle they can be transplanted Brussels seed germination takes place within 7 12 days Brussels