How Tall Does Arugula Grow

If you’re adding arugula to your garden or container, one of the first questions you might have is about its size. So, how tall does arugula grow? This quick guide gives you the simple answer and everything you need to manage its growth for a great harvest.

Arugula is a fast-growing, cool-season leafy green known for its peppery flavor. It’s a fantastic choice for beginners because it’s relatively easy to care for. Understanding its height and spread helps you plan your garden space better and prevents overcrowding.

On average, most common arugula varieties grow between 6 to 12 inches tall when they are mature and ready for harvest. The height can vary depending on the specific type you plant and your growing conditions. Some wild or “sylvetta” arugula can grow even taller, reaching up to 24 inches if left to bolt and flower.

The plant also has a spread, or width, of about 4 to 8 inches. This compact size makes it perfect for tight spaces, including window boxes and small raised beds. Remember, you can start harvesting leaves when they are just a few inches tall, long before the plant reaches its full height.

Factors That Influence Arugula Height

Several key factors will determine how tall your arugula gets. It’s not just about the seed packet information.

1. Variety Choice

Different arugula cultivars have different genetic potentials for height. Here’s a quick comparison:

Standard/Common Arugula: Varieties like ‘Astro’ or ‘Rocket’ typically stay in the 6-12 inch range.
Wild Arugula (Sylvetta): This type has thinner, more jagged leaves and a stronger flavor. It tends to grow taller, often 18-24 inches, and is more bolt-resistant.
Slow-Bolt Varieties: Cultivars like ‘Slow Bolt’ are bred to stay shorter longer, focusing energy on leaf production instead of shooting up to flower.

2. Growing Conditions

Your garden’s environment plays a huge role. Arugula prefers cool weather and consistent moisture.

Temperature: Warm temperatures cause arugula to “bolt.” This means it quickly sends up a tall flower stalk to produce seeds. When it bolts, the plant’s height can double in a short time, but the leaves become bitter.
Sunlight: It thrives in full sun to partial shade. Too much shade can make it leggy as it stretches for light, increasing height but producing weaker leaves.
Soil & Water: Rich, well-draining soil and regular watering support steady, healthy growth. Stressed plants may bolt prematurely.

3. Harvesting Method

How you harvest is perhaps the biggest factor you control. Frequent cutting keeps the plant shorter and bushier.

If you harvest outer leaves regularly (the “cut-and-come-again” method), the plant focuses on producing new low growth.
If you leave it unharvested, it will naturally grow taller until it eventually flowers.

Step-by-Step: Planting for Ideal Growth

Follow these simple steps to get your arugula off to a strong start and manage its height.

Timing is Everything: Plant seeds directly in the garden 2-4 weeks before your last spring frost. For a fall harvest, plant about 6-8 weeks before the first fall frost. Succession plant every 2-3 weeks for a continuous supply.
Planting the Seeds: Sow seeds about 1/4 inch deep in the soil. Space them 1 inch apart in rows that are 6-10 inches apart. You can thin seedlings later to 3-6 inches apart, which gives each plant room to reach its full width without competition.
Initial Care: Keep the soil consistently moist until seeds germinate, which usually takes 5-7 days. Once seedlings are up, water when the top inch of soil feels dry.

How to Manage and Control Its Height

You don’t have to just watch and see what happens. You can actively manage how tall your arugula gets.

Regular Harvesting

Start harvesting when leaves are 2-3 inches long. Use clean scissors to cut individual outer leaves at the base, or cut the entire plant about an inch above the soil. The plant will regrow from the center. This practice keeps plants compact and encourages new, tender growth.

Preventing Bolting

Bolting is the main reason for sudden, excessive height. To delay it:

Choose the Right Season: Grow arugula in the cool of spring and fall.
Use Shade Cloth: In warmer periods, use a shade cloth to protect plants from intense afternoon sun.
Water Consistently: Don’t let the soil dry out completely.
Pick Leaves Often: Heavy harvesting signals the plant to focus on leaves, not flowers.

Thinning Seedlings

If seedlings are too crowded, they will compete for light and grow tall and spindly. Thin them to 3-6 inches apart when they have a few true leaves. The thinned seedlings are edible and make a great microgreen salad!

Growing Arugula in Containers

Arugula is an excellent container plant. Choose a pot that is at least 6-8 inches deep to accommodate its roots. Ensure it has drainage holes. Container plants may dry out faster, so check water daily. The height range remains the same, but container growth can be easier to manage on a patio or balcony.

What to Do When It Gets Too Tall

If your arugula has shot up with a flower stalk, here are your options:

Harvest Immediately: If the stalk is just starting, harvest all remaining leaves at once. They will be more pungent but are still usable in pestos or cooked dishes.
Let It Flower: Arugula has pretty white flowers that are also edible and have a mild peppery taste. They attract beneficial insects. Letting some plants flower can provide seeds for saving or self-sowing for next season.
Pull and Replant: Bolted arugula’s life cycle is nearly complete. You can pull it out and sow new seeds in the space, especially in spring or fall.

Common Problems Related to Growth

Leggy Seedlings: Caused by insufficient light. Move to a sunnier spot or provide a grow light.
Yellowing Leaves: Often a sign of overwatering or poor drainage. Check your soil moisture and container drainage holes.
Holes in Leaves: Usually from flea beetles. Use row covers to protect young plants.

FAQ

How tall does arugula get before harvesting?
You can start harvesting leaves when they are as short as 2-3 inches. You don’t need to wait for the plant to reach its full mature height.

Does arugula grow back after cutting?
Yes, if you use the cut-and-come-again method, cutting about an inch above the soil base, it will typicaly regrow for multiple harvests.

What is the average height and width of arugula?
Most standard varieties grow 6-12 inches tall with a spread of 4-8 inches wide at maturity.

Why is my arugula plant so tall and spindly?
This is usually due to overcrowding (not thinning seedlings) or not enough sunlight, causing the plant to stretch. It can also be the start of bolting due to warm temperatures.

Can you eat arugula after it bolts?
The leaves become much more bitter after bolting, but they are still edible, especialy when cooked. The flowers and seed pods are also edible.

Growing arugula is a simple way to enjoy fresh greens from your garden. By knowing it typically stays under a foot tall and using regular harvesting, you can keep it at a manageable size for weeks. Pay attention to temperature and water, and you’ll have a succesful crop of peppery leaves for your salads and more.