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Growing Cilantro (Coriander)
in South Pasadena, California

A hot-summer Mediterranean growing playbook for South Pasadena — calendar, container, varieties, and the mistakes that ruin local crops.

☀USDA Zone 10a
📅295-day season
🌱Easy difficulty
🏜hot-summer Mediterranean
📐630ft elevation
Published

Quick answer: Cilantro (Coriander) (Coriandrum sativum) can grown in South Pasadena, CA (USDA zone 10a, Pacific Coast). Plant indoors 6 weeks before the last frost on Feb 15. Use a 1-gallon, 8" deep container with well-drained; loamy; moderately fertile, pH 6.2–6.8. Water every 1-2 days at peak summer — South Pasadena's Mediterranean climate is reasonably forgiving. Expect harvest in 21–45 days.

Why grow Cilantro (Coriander) in South Pasadena?

South Pasadena sits in USDA zone 10a (heat zone 7) with a Csa (Mediterranean) climate (Köppen-Geiger / VU Wien) — Pacific Coast. Summer highs reach 88°F (NOAA NCEI) and winter lows fall to 47°F, at 630ft elevation (USGS). Cilantro (Coriander) prefers USDA zones 2–11, killed below 20°F. Cilantro (Coriander) fits the local zone window with normal container care. Surrounding metros — Alhambra, San Marino, and San Gabriel — share the same climate, so this guide largely applies to them too.

The 295-day growing season (Feb 15 to Dec 10) gives you plenty of runway for cilantro (coriander), which take 21–45 days to mature. South Pasadena averages 3200 hours of sunshine annually with 100 chill hours per winter — cilantro (coriander) only need 4–6 hours daily, so light is never the problem. The game in South Pasadena is matching variety to your local microclimate.

Metro-wide climate notes: Alhambra and San Marino sit in the same zone 10a Mediterranean basin as South Pasadena, while San Gabriel at slightly higher elevation runs 2-3°F cooler in winter. Pasadena in the lower valley shares South Pasadena's frost dates almost exactly. The cilantro (coriander) growing strategies in this guide apply across the entire metro.

Also known as: Chinese Parsley; Dhania; Mexican Parsley · Family: Apiaceae · Annual edible.

"Right plant, right place, right time. South Pasadena cilantro (coriander) rewards growers who match cultivar to climate first, then sweat the technique."

When to plant in South Pasadena

South Pasadena's climate gives you a clear cilantro (coriander) window from spring through fall. Here are the dates that actually matter.

The South Pasadena Cilantro (Coriander) calendar

  • Start seeds indoors: 6 weeks before Feb 15
  • Transplant outdoors (spring): After Feb 15 when soil temp ≥ 60°F
  • First harvest: Mid-summer on early-maturing cultivars
  • Peak production: Mid- to late summer
  • Final harvest: Before Dec 10

Container setup for South Pasadena

Cilantro (Coriander) needs a 1-gallon minimum, 8" deep container. Mature plants reach 24" tall × 12" wide.

Material warning for South Pasadena: match container material to the season. Use:

Soil: Well-drained; loamy; moderately fertile, pH 6.2–6.8. Local soil: South Pasadena's native soil is loam (matters for in-ground; containers use potting mix regardless).

Best cilantro (coriander) varieties for South Pasadena

South Pasadena growers do well with these popular varieties (from breeders' lists). Pick by flavor and growth habit:

Care routine for South Pasadena

Water

Container-grown cilantro (coriander) in South Pasadena needs water every 1–2 days at peak summer. Cilantro (Coriander)s are a Medium water-category plant with a baseline of every 2 days in containers. With only 20" of annual rainfall and 60% average humidity, weather provides almost no help. South Pasadena has high water restrictions — drip irrigation and morning watering (before 8am) are both efficiency-smart and rule-compliant.

Metro-wide note: South Pasadena and surrounding Alhambra, San Marino, San Gabriel all share regional water management, so the high restriction schedule below applies regionally.

Fertilizer

Cilantro (Coriander)s are a light feeder. Use a 5-10-10 (low-nitrogen, high-phosphorus/potassium) fertilizer once flowers appear. In containers, nutrients leach with every watering — feed weekly at half strength rather than monthly at full.

Sun

Cilantro (Coriander)s need 4–6 hours of Full Sun. In South Pasadena, morning sun with light afternoon protection during heat waves keeps plants productive without scorching.

Pests & diseases in South Pasadena

Priority pests (South Pasadena + Cilantro (Coriander) intersection)

Both cilantro (coriander) and gardens in South Pasadena are commonly affected by aphids; whiteflies. These deserve weekly inspection — weekly inspection catches problems early.

Also watch for (cilantro (coriander)-specific, less common locally): armyworms; cutworms.

Common cilantro (coriander) diseases: bacterial leaf spot; powdery mildew; damping off; root rot. South Pasadena's temperate climate carries moderate disease pressure; airflow and dawn watering keep most issues in check.

Companion plants & what to avoid

Good companions: tomatoes; spinach; beans; peas; basil; potatoes.

Avoid planting with: fennel (allelopathic); lavender.

Pollination: Cilantro (Coriander)s are self-pollinating — a single plant will set fruit on its own.

Wildlife & pet safety

Deer pressure in South Pasadena: medium (urban metro). Cilantro (Coriander)s are deer-resistant — still good practice to plant within sight of the house in higher-pressure suburbs.

Pet safety: Toxic to cats: No · Toxic to dogs: No. Non-toxic per ASPCA; safe for cats and dogs in small amounts

Harvest expectations

Expect 1-2 cups leaves; 1 oz seed in South Pasadena containers.

Local harvest months: summer through first frost. Standard harvest months elsewhere: May; Jun; Sep; Oct; Nov. Once a plant starts fruiting, expect a 21-day harvest window per planting.

What you harvest: leaves; seeds; stems; roots. Culinary uses: fresh in salsa; guacamole; curries; chutneys; vietnamese pho; tacos; coriander seed in pickling; baking; spice blends.

Grower's tips for Cilantro (Coriander)

Direct sow every 2-3 weeks for continuous harvest; grow in part shade during hot months to slow bolting; harvest outer leaves first; once it bolts let it flower and seed for coriander harvest and to attract beneficial insects

Common South Pasadena cilantro (coriander) mistakes

  1. Transplanting (taproot dislikes disturbance).
  2. planting in midsummer heat (bolts in days).
  3. harvesting too much at once.
  4. planting too thickly causing damping off.
  5. Treating South Pasadena's shoulder seasons like midsummer — variable spring and fall weather punishes calendar planting.

South Pasadena cilantro (coriander) FAQ

Does this South Pasadena guide apply to Alhambra, San Marino, San Gabriel?

Yes — Alhambra, San Marino, San Gabriel, Pasadena, San Pasqual all share South Pasadena's USDA zone 10a, Csa climate, and 295-day growing season. The varieties, planting calendar, and care advice in this guide apply across the entire metro. Subtle elevation differences shift frost dates by only a few days.

Can I grow cilantro (coriander) year-round in South Pasadena?

South Pasadena's 295-day growing season covers spring through fall. Year-round only with indoor or protected cultivation in winter.

What's the best month to plant cilantro (coriander) in South Pasadena?

Transplant after the last frost on Feb 15 when soil temp at 4" reads ≥ 60°F. Start seeds indoors 6 weeks earlier.

Do I need a greenhouse for cilantro (coriander) in South Pasadena?

Not required, but a season-extension structure helps in shoulder months. Most South Pasadena growers do fine with open-air containers.

How much sun do cilantro (coriander) need in South Pasadena?

Cilantro (Coriander)s need 4–6 hours of direct sun. South Pasadena delivers 3200 annual sunshine hours — plenty for full production with a south or west exposure.

What USDA zone is South Pasadena?

South Pasadena is in USDA hardiness zone 10a with AHS heat zone 7. Last frost typically Feb 15, first frost Dec 10, giving a 295-day growing season.

Where can I buy cilantro (coriander) seedlings near South Pasadena?

Check South Pasadena's 1 farmers markets and local nurseries. Your state extension (https://ucanr.edu) lists certified suppliers and runs seasonal plant sales. 2 community gardens across the metro also share seedlings.

Are cilantro (coriander) safe for my pets in South Pasadena?

Toxic to cats: No; toxic to dogs: No. Non-toxic per ASPCA; safe for cats and dogs in small amounts Keep curious pets out of the container or use a cage.

How much water do cilantro (coriander) use in South Pasadena?

A 1-gallon container needs roughly 0.5–1 gallon per day in summer (sometimes 2 gallons during heat waves). South Pasadena's high water restrictions limit watering times, not amounts — drip irrigation and morning watering before 8am stays efficient and compliant. Rainfall averages 20" annually.

South Pasadena gardening resources

Data sources

Climate, geographic, and toxicity data on this page come from public datasets. Cultivar profiles and growing recommendations draw on land-grant university extension research.