Chives in Zone 9A — Northern California

Chives are a fantastic addition to any Northern California garden. Their mild onion flavor elevates everything from eggs to salads, and they're incredibly easy to grow in our Mediterranean climate. Plus, the cheerful purple flowers attract pollinators, adding beauty to your veggie patch or herb garden.

We do face challenges like summer heat and water restrictions, but with a little planning, Chives thrive here. Our long growing season, nearly 10 months, means you can enjoy fresh chives for most of the year.

Starting Chives indoors makes sense if you're eager for an early harvest or want a head start. Begin in early to late December, about eight weeks before our typical last frost. Use seed trays or small pots filled with a good seed-starting mix.

Keep the soil consistently moist – bottom watering is ideal to prevent damping off. Place the trays in a warm spot with plenty of light; a sunny windowsill or grow lights work well. Since spring arrives early here, indoor starting can give you bigger plants to set out.

Transplant your Chives seedlings outdoors from early February through early March. Before planting, harden them off by gradually exposing them to outdoor conditions for about a week. This helps them adjust to the sunlight and temperature swings.

Choose a spot with full sun to partial shade, and space the plants 8-12 inches apart. While our winters are mild, keep an eye out for any unexpected late frosts, especially in inland microclimates. Honestly, buying starts or dividing established clumps is a much faster way to get a good harvest than starting from seed.

Direct sowing Chives is an easy option, and you can do it from late January through early September. Prepare the soil by loosening it and adding compost. Sow seeds about ¼ inch deep and keep the soil consistently moist until they germinate.

Keep in mind that Chives are slow to establish from seed, so be patient. You can always direct sow in succession, every few weeks, for a continuous supply. However, for quicker results, consider dividing existing clumps or buying starts from a local nursery.

Chives need consistent moisture, especially during our dry summers. Aim for moderate watering – they're more tolerant of moisture than many other herbs. A good rule of thumb is to water deeply when the top two inches of soil feel dry to the touch. We call that the "finger test."

During the hotter months, your Chives might need about an inch of water per week, either from rainfall or irrigation. Water at the base of the plant to avoid wetting the foliage, which can encourage fungal diseases in humid microclimates. In the cooler, wetter months, you can reduce watering frequency.

Watch for signs of underwatering, such as wilting or yellowing leaves. Overwatering can lead to bulb rot, so ensure the soil is well-draining. A layer of mulch around the base of the plants helps retain moisture and suppress weeds, which is especially helpful during our long, dry summers.

You can expect your first Chives harvest from mid April through mid December, about 80 days after planting from seed. The leaves are ready to harvest when they're at least 6 inches tall. Snip the leaves about 1-2 inches above the base of the plant.

Harvesting regularly encourages new growth, so don't be shy! Cut the leaves evenly to maintain a tidy appearance. As the first frost approaches in early December, you can either leave the plants in place for winter – they're quite hardy – or cut them back and let them rest. Divide the clumps every three years to keep them vigorous.

Here are some common problems you might encounter with Chives in Northern California:

Onion Fly

• What it looks like: Wilting or yellowing leaves, stunted growth, and small white maggots at the base of the plant or in the bulbs.
• What causes it: Onion flies lay their eggs near the base of onion family plants. The maggots hatch and feed on the bulbs and roots.
• How to fix/prevent it: Use row covers to prevent flies from laying eggs. Remove and destroy any infested plants. Introduce beneficial nematodes to the soil.

Rust

• What it looks like: Rusty orange, yellow, or brown pustules on leaves and stems, mostly on undersides. Leaves yellow and drop prematurely.
• What causes it: Various rust fungi that spread via wind-borne spores. Favored by warm, humid conditions with moisture on leaves.
• How to fix/prevent it: Remove affected leaves. Avoid overhead watering. Improve air circulation. Apply sulfur or copper fungicide. Don't work among wet plants. Rotate crops.

Bulb Rot in Wet Soil

• What it looks like: Yellowing or browning leaves, mushy bulbs, and a foul odor.
• What causes it: Overwatering or poorly draining soil can create conditions that promote fungal growth and bulb rot.
• How to fix/prevent it: Ensure the soil is well-draining. Avoid overwatering, especially during our wetter months. Plant Chives in raised beds if your soil is heavy clay.

Northern California Specific Challenges: Our moderate-to-hot summers and low humidity can stress Chives if they're not watered consistently. The dry-summer rainfall pattern means you'll need to provide supplemental water, especially during July and August.

Chives make excellent companions for many plants in your Northern California garden. Carrots benefit from Chives because they deter carrot root flies. Tomatoes thrive alongside Chives, as they repel aphids and other pests. Roses also benefit from Chives' pest-repelling properties, and grapes are said to have improved flavor when planted near them.

Avoid planting Chives near beans or peas. Chives can inhibit their growth. By choosing the right companions, you can create a thriving and pest-resistant garden.