How to Plant and Grow Romanesco Broccoli

Brassica romanesco is the scientific name of this visually enthralling tasty member of the Brassica family. It is most commonly called romanesco and is closely related to broccoli and cauliflower.

It produces spiraling light green heads that contain smaller florets that grow in a circular pattern around the central head – its unique growth pattern combined with its neon green coloration create a hypnotic head of broccoli (actually cauliflower). Romanesco broccoli has been cited by mathematicians as an example of logarithms, fractals and spirals.

Other names it is referred to include broccoflower, coral broccoli, Romanesco cauliflower, and Romanesco cabbage. The flavor is similar to cauliflower but creamier with a hint of nut.

They are cool weather vegetables that fare well in USDA zones 3 -10. The plants span 1.5 – 2.5 feet in diameter, at times a tad more. You’ll need to give these plants a wide berth when growing them. The edible heads dominate the plant and can be spotted for miles away in an open field. 

Soil – Well Drained sand or light loam – no clays. Prep the soil with abundant organic material – compost or rotted manure . Full Sun is best – partial shade is tolerable.

To grow via direct seeding – sow in mid to late spring in temperate zones. In colder regions they are best started indoors or a protected location roughly 6 weeks before anticipated last frost date.

Transplant outside at an opportune time. Planting Romanesco broccoli seed in late summer will yield a fall harvest. 

As previously stated these plants need plenty of space, leave at least 2 feet between rows with plants being 3 feet apart within the rows.

Care and Maintenance


They will grow under less than optimal watering, but the heads will not develop as large or as tasty . It is best to keep these plants well watered and consistently wet – not water logged – just moist. Provide at least an inch of water weekly, soaking the soil to about a 6 inch depth.

Romanesco broccoli needs consistent moisture to produce desirable large, tender heads. Dry spells can cause the heads to split and destroy the ‘algorithmic” heads appearance and quality.


Romanesco is a heavy feeder, and plants take up nutrients best when the soil pH is between 6.0 and 7.5. A nitrogen rich fertilizer is also advisable.

About three weeks after transplanting, side-dress with blood meal or fish emulsion, and water deeply. Repeat this monthly until about one week prior to harvest.


A prolonged period of cold nights or very warm days will produce tiny, immature heads known as buttons. Protecting Romanesco brocolli plants with Cloches or row covers is at times a good idea. 

An occasional problem encountered when growing Romanesco Broccoli is bolting to Seed – particualrly under hot conditions. In temperate zones you can get 2 crops, one in spring and another in early fall. Excessive warm spells can also cause the heads to prematurely open.

Broccoli Romanesco is a cool season plant that rapidly bolts to seed when exposed to high heat. In temperate zones you can get a spring crop and an early fall crop. In regions with Hot summers you would be well advised to start earlier in the spring to harvest before the sun bares down full force, or later in the growing season for a fall harvest.


Harvest before the plant flowers. Cut directly below the point where the stems start to separate. Once you’ve harvested the main head, side shoots will sometimes grow. So long as the weather permits you can keep harvesting the side shoots.

Romanesco Broccoli is tasty enough to devour fresh or steamed but can also be frozen. It can be refrigerated for up to 2 weeks.

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