A stalwart among winter vegetables in cool temperate climates, they taste much better when harvested from the garden after being frosted than when bought from the shop. Brussels sprouts. The earliest that you can plant brussels sprouts in Zone 9a is January. You will be able to determine when to plant brussels sprouts by checking out the USDA zone info for Zone 9b. Temperatures are mild enough for growing vegetables in winter … One of the plants stalk kind of grew sideways and that plant never did put on sprouts. A long-growing vegetable, Brussels sprouts require approximately 80 to 100 days when grown from seed until harvest. The last month that you can plant brussels sprouts and expect a good harvest is probably October. Add 3- to 4- inches of compost and well-aged manure into planting bed, before transplanting; Brussels sprouts need friable, moisture-holding soil. If you are using an existing garden, remove all old plant detritus and weeds. The sprouts never did get very big, maybe the size of a large marble but there were a lot of them. Cabbage plants typically show a better yield when planted for fall harvest. In more tropical climates, like those some parts of USDA Hardiness Zones 10 and 11 fall into (and comparable locations throughout the globe), it isn’t impossible to grow these vegetables, but you’re not likely to get the best results. However, you really should wait until February if you don't want to take any chances. In the coldest months of winter we should expect an average low temperature of 25°F. Probably not a good time to plant brussels sprouts The earliest that you can plant brussels sprouts in Zone 9b is January. You may be interested in our other planting guides for Zone 9a. Grow Brussels sprouts in full sun for best yield—tolerates partial shade. Since the USDA zone info for Zone 9b may not be accurate from year to year our actual date of last frost changes from year to year. The goal is to have Brussel sprouts planted out at least two months before the first frost in the fall. Gardeners in cooler areas can grow a spring crop if they plant them outside as soon as the soil is workable. The last month that you can plant brussels sprouts and expect a good harvest is probably October. Most vegetables and herbs can be grown in this area including many suited to sub-tropical conditions. In warmer climates, brussels sprouts are planted in mid to late summer and harvested in early winter. Brussels sprouts (Brassica oleracea variation gemmifera) are hardy biennial plants that typically are grown as annuals and do well in U.S. Department of Agriculture plant hardiness zones 2 … On most years you should be prepared to experience lows near 30°F. You may be interested in our other planting guides for Zone 9b. Always keep in mind that USDA zone info for Zone 9a may not be accurate from year to year and our actual date of last frost will vary from year to year. The seedlings should be planted out when they are approximately five to six weeks old, at a height of around six inches (15 cm). Some of the sprouts higher up on the stalk never did firm up. Avoid planting where cabbage family crops have grown recently. Brussels Sprout Plants That Produce Large Sprouts. Half of the time in Zone 9a last frost occurs after February 15 so make sure that you are prepared to protect your brussels sprouts if we have a surprise late frost. This region is perfectly suited to not only a spring sown garden for summer crops but also a winter vegetable garden in zone 9. Before planting it is a good idea to find our USDA Zone info to estimate our garden schedule. The last frost date is at the beginning of March and the first frost date is about mid December. The average date of last frost is February 15 in Zone 9b. 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