Vegetable · Brassicaceae
Broccoli Rabe
Brassica rapa Ruvo Group
Sow it in the cool ends of the season, cut while the buds are tight, and broccoli rabe rewards you with sharp, savory greens.
Full sun
Every 2–4 days
39–75°F · 4–24°C
40–60 days
Overview
Broccoli rabe looks like a loose, leafy broccoli, but it belongs to the mustard family and sits much closer to the turnip. Gardeners grow it for the whole shoot, the leaves, the slim stems, and the clusters of tight flower buds, all carrying that signature bite that turns mild and nutty once cooked. You may also see it sold as rapini or cime di rapa.
It grows fast and asks for little, which makes it a forgiving crop for a beginner. The catch is timing. This is a cool-season vegetable that bolts and flowers the moment the weather warms, so it does its best work in the cooler stretches of spring and fall rather than the heart of summer.
Get the season right and the rest falls into place. Steady moisture, decent soil, and a sharp eye for when the buds are ready give you tender, savory greens in well under two months.
Care
The short version: full sun and cool weather, with rich, evenly moist soil and a balanced feed worked in at planting. Cut the budded shoots while the buds are still tight, and time your sowings for spring and fall to dodge the heat.
Light
Give broccoli rabe full sun for the strongest growth, though it takes a bit of partial shade in stride. In the warmer parts of the season, that light shade can buy you a little time before the heat pushes it to bolt.
Water
Keep the soil evenly moist and water it every 2 to 4 days, never letting it dry out between drinks. Drought stress is the fast track to early bolting and split, bitter heads, so consistency matters more than volume.
Soil
Plant in fertile, well-drained loam worked full of compost and organic matter. It is easygoing about acidity and grows well anywhere from a pH of 6.0 to 7.5.
Temperature
This is a cool-season crop that thrives from about 39°F to 75°F (4°C to 24°C). Push it much past that and it bolts, which is why it shines in spring and fall rather than summer.
Humidity
Ordinary outdoor air suits it fine, so there's no humidity target to hit. What counts is steady soil moisture, not anything in the air around the leaves.
Feeding
Work compost or a balanced nitrogen fertilizer into the bed at planting, and that handles most of the job. A side-dressing of compost partway through growth gives it a useful boost, but go light, since too much nitrogen draws aphids.
Pruning
Here the harvest is the pruning. Cut the central budded shoot while the buds are still tight, and the plant pushes out tender side shoots to take its place. Snip off any stalk that starts to flower to keep the rest mild and producing.
Repotting
not_applicable
Size & spacing
Plants reach 18 to 30 inches (45 to 75 cm) tall and stay fairly slim. Thin or space them about 6 to 12 inches (15 to 30 cm) apart so each one has room to fill out.
When to plant
Broccoli rabe runs on the calendar more than most crops. Sow it in early spring as the soil wakes up, then again in late summer for a fall picking, and skip the warm middle of the year, when heat sends it straight to flower.
Northern hemisphere
Southern hemisphere
Typical months for a temperate climate: start earlier in warm zones, later where spring frosts linger.
- Sow: Optional: 4-6 weeks before transplanting, though the crop is usually direct-sown
- Plant: Early spring (about 2-4 weeks before last frost) and again in late summer/fall; cool-season crop that bolts and flowers fast in heat
- Harvest: Cut the budded shoots while the flower buds are still tight and green, before the yellow flowers open
Hardiness
USDA hardiness zones: 3–10
Temperature: down to -40°C
Troubleshooting
Almost everything that goes wrong with broccoli rabe shows up on the leaves or in shoots that flower too soon. Catch the early signs and most problems are easy to head off. Match what you see below, then act before it spreads.
Tiny round holes peppered across the leaves
This is the work of flea beetles, little black insects that jump away the moment you brush the plant. They hit young seedlings hardest, so cover new sowings with floating row cover and keep the plants moist enough to outgrow the chewing.
Fix:
- Cover seedlings with floating row cover at sowing
- Keep plants vigorous with even moisture to outgrow damage
Ragged leaves, green caterpillars, and dark droppings
Green caterpillars chewing the foliage are usually cabbage loopers, imported cabbageworms, or diamondback moth larvae, and the white butterflies fluttering nearby are laying the next batch. Pick the caterpillars off by hand, and spray Bacillus thuringiensis if they get ahead of you.
Fix:
- Handpick caterpillars
- Apply Bacillus thuringiensis (Bt)
Buds opening early and the greens turning bitter
When a warm spell pushes the buds open into yellow flowers before you can pick them, the plant is bolting, and the shoots turn bitter as it happens. Cut everything right away while any buds are still tight. Time your sowings for the cool ends of the season and keep the soil evenly moist to hold it off.
Fix:
- Harvest immediately while buds are still tight
- Sow during the cool part of the season
The whole plant running to seed in the heat
A cool-season crop carried into warm weather will run to seed all at once, stretching tall and flowering across the board. This is heat-driven bolting, and there's no walking it back. Harvest the entire planting at once and aim future sowings squarely at the cool windows.
Fix:
- Harvest the entire planting promptly
- Time future sowings for cooler weather
Curled, sticky leaves crowded with small insects
Those soft-bodied clusters massed on the shoot tips and leaf undersides are aphids, and the sticky film they leave behind is honeydew. Blast them off with a strong jet of water, and reach for insecticidal soap only if the numbers keep climbing. Skip the heavy nitrogen feed, since lush new growth is exactly what draws them in.
Fix:
- Wash off with a strong spray of water
- Apply insecticidal soap if populations build
Toxicity
There's nothing to worry about here. Broccoli rabe is a plain edible vegetable, safe to grow and handle around pets, livestock, and children, and the ASPCA doesn't list it as toxic. The leaves, stems, and buds are the parts people eat.
Safe for
People · Cats · Dogs · Horses · Rabbits · Livestock · Birds
Cats None
Nothing to worry about here. A curious cat that nibbles a leaf won't come to any harm.
Dogs None
Safe for dogs, and a few stolen leaves cause no trouble. Like any new food, a large gulp might pass as a brief bit of gas.
Horses Safe
Horses can graze the leaves without concern. The plant carries no toxin that affects them.
Rabbits Safe
A fine leafy green for rabbits in sensible amounts, alongside their usual hay and pellets.
Livestock Mild
Cattle, goats, and sheep can eat it safely as part of a mixed diet. The only caveat is heavy, sustained grazing on brassica forage, where the natural goitrogens can nudge thyroid function over time.
Birds Safe
Backyard hens and other birds can peck the leaves and buds without any risk.
People Safe
This is a vegetable, after all. The leaves, stems, and tight flower buds are all good to eat, usually blanched and then sauteed to take the edge off the bitterness.
Safe to handle and grow around pets and children; the leaves, stems, and buds are commonly eaten.
Varieties
Most broccoli rabe is sold simply as rapini, but a couple of named selections are worth knowing for how fast they come in and how well they hold against bolting.
Spring Raab
A bolt-resistant pick for spring sowing that comes in fast, in roughly 40 to 45 days.
Zamboni
Grows into even, small-leaved plants and matures over a wider stretch of about 45 to 70 days.
How to propagate
Broccoli rabe is one of the simplest crops to start, since it goes straight into the ground from seed with no fuss and no transplanting required.
SeedEasy
Direct-sow in early spring and again in late summer for a fall crop · About 7-14 days to germinate and 40-60 days to harvest
Broccoli rabe grows easily from seed sown right where it will grow. Drop seed about a quarter to half an inch deep, and once it sprouts in 7 to 14 days, thin the plants to roughly 6 inches apart. Sow in early spring and again in late summer, and stagger small batches a couple of weeks apart for a steady run of harvests through the 40 to 60 days each planting takes to mature.
Myths
Broccoli rabe is a kind of broccoli.
Despite the name and the look, it isn't broccoli at all. It is a fast-growing turnip relative, Brassica rapa in the Ruvo Group, grown for its leaves, stems, and immature flower buds rather than for any tight green head.
You can let the buds open into flowers and still get good flavor.
Once the buds open, quality falls off and the shoots turn sharply bitter. Cut while the buds are still tight and green for the mildest, most tender greens.