The plants also require ample nitrogen and this should b applied as a side-dressing of fertilizer about half way through the growing season. Plant spacing will greatly affect the final size of the cauliflower head and the plants should be spaced at least 46 cm (18 in) apart leaving approximately 75 cm (30 in) between rows.Ĭauliflower requires consistent moisture during the growing season in order to produce large, tender heads. Seedlings can be transplanted when they are approximately 6 weeks old after hardening. Plant seeds in a sterile seed starting mix to a depth of 0.6-1.3 cm (0.25-0.5 in) deep and keep moist. Peat pots work well for growing seedlings as damage to the roots during transplanting can be avoided. Only mature plants will survive frost in the Fall.Ĭauliflower is most successfully grown from transplants started in the glasshouse or indoors. ![]() It is best grown as a Fall crop in cooler areas. Cauliflower is less cold hardy than its relatives and it should be planted after the last frost as sub-freezing temperatures are likely to damage the plant. The plant requires consistent cool temperatures to prevent ‘buttoning’ - the formation of several small heads instead of one large one. A high amount of organic matter in the soil will help to hold moisture. Cauliflower is a cool season crop and grows best in well draining, organic soil at a pH of 6.5 or above.
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