How to grow Romanesco Veronica Seeds
To grow Romanesco Veronica seeds, begin by selecting a sunny location with well-drained, fertile soil. Start the seeds indoors about 6-8 weeks before the last expected frost. Romanesco grows best in cool weather. Buds will not develop well in extreme heat or drought. It will survive frost down to 20–25°F, although any mature heads will be damaged in a hard freeze.
Sow the seeds approximately 0.5 cm deep in seed-starting mix, keeping the soil consistently moist at a temperature of 18-21°C. Germination takes approximately 7-14 days. Once the seedlings have developed 4-6 true leaves and the danger of frost has passed, transplant them outdoors. Sow Outdoors 2–3 weeks before the last expected frost date. For an autumn crop, sow 9 weeks before the first expected frost date.
Space the plants about 60 cm apart in rows that are 60-75 cm apart. Water the plants regularly to maintain even soil moisture, and mulch around the plants to help retain moisture and regulate soil temperature. Romanesco Veronica prefers cooler weather, so consider planting in early spring or late summer for a fall harvest.
Romanesco does best in full sun but will tolerate partial shade. It prefers loose, well-drained loamy soils with a high amount of organic matter and consistent soil moisture. Add compost or an organic fertilizer that is higher in potassium and phosphorus than nitrogen to your soil before planting.
Fertilize the plants with a balanced fertilizer every few weeks to promote healthy growth. The heads should be ready to harvest in about 75-100 days when they are firm and approximately 10-15 cm in diameter. When harvesting, leave at least 5cm of stem attached to the base.