![]() Most brassica plants like cauliflower grow best when the plants are at about 60°-65☏ (16°-18☌). Cauliflower seeds usually sprout within about one week indoors. Place containers near a window where they can receive ample light throughout each day-ideally 8-10 hours per day-and keep temperatures between 65-75 degrees Fahrenheit during germination time (7-14 days). Gently press down on this layer so that all seeds are securely covered and will have direct contact with moisture when watered again later on. Plant 2-3 seeds in the hole and cover with more moist potting mix. Poke small 1/4 inch deep holes in each container. Make sure all your supplies and tools are clean to minimize the chances of spreading disease.įill your containers with moist potting mix. The key to successful indoor seed planting is providing the right environment for germination and growth.īefore planting, you’ll need to select a container with drainage holes at the bottom and fill it with clean potting mix that’s rich in organic matter. Depending on the climate and growing season, cauliflower can be planted indoors in either spring or fall. Planting cauliflower seeds indoors is a great option for an early start on your garden. Outdoors, you’ve got less control, but the cooler temperatures make the seedlings less prone to common fungal diseases. Indoors, you can put the seed-starting tray on a seedling mat or on a heated floor. The optimal soil temperature for cauliflower seed germination is in the range of about 45°-85☏ (7°-30☌). Water regularly, using lukewarm water if possible this will help keep your plants hydrated without shocking them with cold water. Place your pots near a window where they will receive plenty of sunlight, but not too much direct heat from outside temperatures. Cover the seeds with a bit of soil and water well. Use 2-3 seeds per hole if you’ve got lots (and thin out the weakest seedlings later). Sow the seeds in small holes about 1/4 inch deep. Fill each container with moist potting soil, leaving about a half inch of room. If planting indoors, use small containers or seed starting trays that drain out excess water easily. Cauliflower is most commonly started indoors as it transplants easily, but the seeds can go straight in the soil outside too. Cauliflower is considered a cool-season crop and prefers the cooler weather of shoulder season to the heat of summer.Ĭauliflower seeds can be sown indoors in seed starting trays for later transplanting out into the garden, or the seeds can be sown directly in outdoor soil. When planting cauliflower seeds, you should follow several important steps to ensure success. Planting cauliflower seeds is a great way to grow some of your own produce. Start cutting when the heads are firm once the florets start to separate, it is too late.Need more info? The basics of how to plant cauliflower seeds Once the plants are growing well, add 30g (1oz) per square metre of high nitrogen fertiliser such as sulphate of ammonia to boost growth and curd formation. Water well in dry weather, watering every 10 days, and apply sufficient water to thoroughly wet the root zone. Space summer and autumn cropping types 60cm (2ft) apart and winter cultivars around 75cm (2.5ft) apart spacing of 30-45cm (12-18in) apart, provides mini, 'one person' curds. ![]() Firm the soil very well against the roots. This will fill the hole with soil and ensure the plant is sitting in a large area of moist soil. To avoid problems, water plants well the day before transplanting and make a hole deep enough to hold the plant with the lowest leaves at ground level. If growth is checked, at any time during growth, they produce small, deformed heads. Firm the soil by treading before planting. The main sowing period is March to May, although early crops can be achieved by sowing under glass in January/February or sowing cultivars in the autumn in a glasshouse or coldframe.Ĭauliflowers do best in very fertile soil, and digging in a bucketful of well-rotted manure or organic matter before planting, and raking in 150g per sq m (5oz per sq yd) of Growmore or other general purpose fertiliser, will help growth. As cauliflowers mature in a rush, avoid raising too many plants at a time. However, best results come from sowing in cell trays using any good multi-purpose potting compost. Thin the seedlings to a final spacing of 15cm (6in) apart for mini caulis or 60cm (24in) for larger cultivars. Final rows should be 15cm (6in) apart for mini caulis or around 60cm (24in) for larger cultivars. Mature plants tolerate frost and need the coolest part of the year to develop heads. Cauliflower will cross-pollinate with other Brassicas. They prefer well drained soil with near neutral pH and sunny spot. Mark Twain called it cabbage with a college degree. Cauliflowers originated from southern Italy. Small white, fine quality dense heads, grow quickly and mature in 68-70 days.
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