Fava Beans: Cover Crop & Edible Harvest

Fava beans, or broad beans, are near the top of my favorite cool-season crops list. I love the harvests, and the plants are a source of organic material for my garden at the end of the season. Over the years, I’ve learned a few tips and tricks for growing fava beans in my warm climate, and I’m happy to share them with you.

Why Grow Fava Beans?

• Cool-Season Tolerance: Fava beans handle cool weather and mild frosts well, making them an excellent winter crop in the low desert. Vroma is my favorite variety for our short-day winters. As spring temperatures rise, flowering and production eventually slow.
  
• Long Harvest Window: A single planting can yield beans for many weeks.
  
• Cover Crop Benefits: When temperatures soar and plants stop producing, chop them down and drop them in place as a “green mulch.” Top with compost, and plant your next crop immediately. The spent fava plants break down quickly in warm weather, adding valuable organic matter to the soil.
  
• Early Blossoms for Pollinators: Fava beans bloom early in the season (often in January) which helps feed local pollinators when other flowers aren’t available.

Fava beans do double duty as a food crop and soil builder. See why I included them on my list of top fall vegetables for mild-winter gardeners.

When to Plant Fava Beans

In cooler or cold winter zones, start them in early spring as soon as the ground can be worked. In mild-winter climates, sow them in fall for a winter-into-spring crop.

Here in the low desert, I like to plant in October. You can plant from October through January, but remember, the later you plant, the shorter the harvest window. Planting in fall allows the beans to grow during cooler months and keep producing until it gets hot.

Once the cool season ends, switch from fava beans to a warm-season crop like lima beans. Learn how to grow lima beans.

Seeds or Transplants

I’ve had equal success starting favas from seeds and transplants; they tolerate transplant shock better than many legumes.

My favorite for warm, short-day winters is Vroma, whose blooms aren’t triggered by day length, while the classic Broad Windsor remains the most widely grown variety.

Fava beans do best in loamy, well-draining soil. They’ll tolerate heavier soils if they drain reasonably well, but avoid waterlogged spots.

• Rhizobium Inoculant: Fava beans fix nitrogen through a partnership with specific Rhizobium bacteria. If you haven’t grown fava beans or a compatible legume in that soil before, coating the seeds with an inoculant labeled for fava or broad beans can help ensure the correct bacteria are present. This is the one I use on Amazon.

Quick note: I mixed these up before, Rhizobium bacteria fix nitrogen for legumes, while mycorrhizal fungi help with water and nutrient uptake but don’t fix nitrogen

• Soil Prep: Amend the bed with a generous layer of compost and a handful of worm castings before planting.
• Spacing: I plant four fava beans per square foot in my raised beds. For traditional rows, space plants about 8 inches (20 cm) apart.
• Depth: Plant seeds 1–2 inches (2.5–5 cm) deep.
• Moisture: Keep soil consistently moist (not waterlogged) until seedlings emerge.
• Thinning: If direct-sown seedlings sprout too close together, thin them back so each plant has about 8 inches (20 cm) of space to grow.

Caring for Fava Beans

Support and Staking

Fava bean plants can grow tall and top-heavy, especially when loaded with pods. They often flop over, so be ready with:

• Individual Stakes: I put a bamboo stake next to each stem and clip it in place.
  
• Corralling Method: Drive stakes at the corners of your bed and run two tiers of string around the plants to keep them upright.

Choose whichever method is easiest. Support will prevent plants from bending or breaking under their own weight.

Watering Needs

Check your soil. Cooler temperatures will mean less watering, but as temperatures climb, or in the fall when it’s still warm you may need to water more often. A layer of mulch helps to keep the moisture in the soil. 

Pinching Tops for Better Pods

Once the lower flowers begin forming pods, pinch off the tender growing tip. This can direct more energy toward the developing pods and also removes the soft growth where black bean aphids often gather.

Pests and Diseases

Fava beans are generally trouble-free during our cooler weather. As temperatures rise in spring, aphids often gather on the tender growing tips. Before treating them, look closely for ladybugs, lacewings, parasitic wasps, and other predators that may already be feeding on them.

Brown or black spotting can also appear on leaves or pods. Fava beans can develop diseases such as chocolate spot and rust, especially when conditions favor disease. Good airflow and avoiding overcrowding can help. By the time heat, pests, and disease pressure begin increasing in the low desert, the fava season is often winding down anyway.

 Learn more about using beneficial insects as pest control in this guide.

Other Problems: Diseases like chocolate spot fungus or rust can occur in very damp conditions, so ensure good airflow by not overcrowding plants. Favas are resilient, especially if planted in well-draining soil and mild temperatures.

Harvesting and Using Fava Beans

Fava beans typically reach maturity around 75–90 days from direct sowing. 

When to Harvest

• Young Pods: Many gardeners prefer to harvest pods at “finger size,” when they can be eaten whole. They’re tender, sweet, and delicious.
  
• Mid-Size Pods: At this stage, you can shell the beans, briefly blanch them, and slip off their outer skins for a creamy texture.
  
• Dry Beans: Leave pods on the plant until they turn dark brown. Shell them for long-term storage, remembering to soak the beans overnight before cooking.

Harvesting Tips

Pods grow in pairs along the stem. To pick them without damaging the plant, clip them off with hand pruners or try this method:

• Gently push the pod downward toward the main stem.
• Snap it off in a single smooth motion (it’s often easiest to harvest two pods at a time if they’re growing next to each other).

Fava beans taste best right off the plant and can be kept in the fridge for only a few days before losing flavor and texture. If you plan to shell and freeze them, do so promptly for maximum freshness.

How to Prepare 

Experiment with different stages and cooking methods to find your favorite flavor and texture.

• Young, tender pods can be cooked whole. Steam or sauté them until tender.
• Once the beans become larger, shell them. Larger beans often have a tougher outer skin that can be slipped off after blanching.
• Mashed or pureed favas make a tasty dip similar to hummus. 

Important: Fava beans can cause a serious reaction in people with G6PD deficiency. Anyone with G6PD deficiency should avoid fava beans.

Edamame beans offer another delicious garden option—check out my tips for growing edamame successfully at home.

Chop-and-Drop Cover Crop (with or without a Harvest)

One of the best things about fava beans is how you can tailor them to your garden goals:

• For the Greatest Nitrogen Benefit, No Harvest: If your main goal is using fava beans as a cover crop, let the plants grow until they begin flowering, then cut them before they put much energy into developing pods and seeds. Cut the plants at ground level and leave the roots and nodules in place to decompose.
• Cover Crop + Edible Harvest: If you want both fresh beans and soil-building benefits, let the plants produce pods first. Once production slows, harvest the beans, cut the stalks at the soil line, and leave the roots in place. Some nitrogen leaves with the harvested beans, but the roots and remaining plant material still add organic matter and recycle nutrients as they decompose.

How I Do It in My Garden:

1. Cut back at the right time: Decide whether you’re after nitrogen only (chop at bud stage) or both beans and nitrogen (chop after you’ve harvested pods).
2. Chop at Ground Level: Use garden shears to cut the plants right at the soil line, leaving the roots undisturbed.
3. Spread and Plant: Chop the stalks and scatter them evenly over the bed. Top with a thin layer of compost, then let them break down or if you’re impatient like me, go ahead and plant your next crop—zinnias, summer veggies, or whatever you like.
4. Watch It Work: In warm weather, the fava residue breaks down rapidly, adding organic matter while the roots and plant residue gradually release nutrients as they decompose.

If you’re looking for cover crops that stand up to high temperatures, check out my guide on Heat-Tolerant Cover Crops for Summer Gardens to discover options that thrive when it gets hot.

Saving Seeds

If you like the variety you grew, saving seeds is easy:

• Allow some pods to fully mature and turn dark brown on the plant.
• Harvest the pods and let them dry thoroughly.
• Shell the beans and store them in a cool, dry place.
• Next season (or whenever you’re ready), plant these saved beans for a repeat performance.

Learn more about how to save seeds in this guide.

Health Benefits of Fava Beans

Fava beans are a good source of plant protein, fiber, folate, iron, and other nutrients.

Always remember to consult with a healthcare professional if you have any dietary concerns, especially if you have conditions like G6PD deficiency, as fava beans can pose risks in certain cases.

Fava Bean FAQs

Further Reading on Beans

• How to Grow Black-Eyed Peas
• How to Grow Tepary Beans
• Borlotti Beans: How to Grow This Garden Favorite

Fava beans are a crop I will always make room for in my cool season garden. They’re delicious and simple to grow. Broad beans produce well, fix atmospheric nitrogen, and leave plenty of roots and organic material behind for my soil. Plus, the early blooms feed hungry pollinators at a time when flowers can be scarce. I hope you’ll give them a try.