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Calypso Cilantro
Photo: "Cilantro" by R'Balfe · CC BY-SA 2.0

Calypso Cilantro

Open Pollinated · Apiaceae

The slowest-bolting cilantro available — resists bolting 3 weeks longer than Santo in side-by-side trials. Compact, bushy plants with a low growing point for cut-and-come-again harvesting. British breeding program. Fragrant, citrusy leaves for salsa, guacamole, and Asian cuisine. Also produces coriander seed at ~120 days. Key facts: 50–55 days to maturity, 4+ hours of sun, 6–8 " spacing. Container-friendly (minimum 2-gallon pot).

Updated May 14, 2026 · Backed by 6 cited sources
Overview

At a Glance

The essentials first: timing, light, spacing, seed-starting, container fit, and overall size.

Days to maturity
50–55 days
Sun
4+ hours
Full Sun In Cool Weather; Partial Shade In Summer Delays Bolting.
Spacing
6–8 "
between plants
Container
Yes
2+ gallon pot
Height
1–1.5 ft
at maturity
Planting window

Zone Planting Guide

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This card updates instantly with viability, frost timing, and any planting notes for your selected zone.

Care

Growing Guide

Everything in one place: seed starting, transplant timing, watering, soil, and structural support.

Seed starting
Germination
Time7–10 days
Optimal temperature60°F
Seed depth0.5"
Moisture
Watering
Weekly1 "
NeedsModerate
Keep soil evenly moist without waterlogging.
Root zone
Soil
pH range6.2–6.8
PreferredLight, Well Drained. Don't Over Amend.
Resilience

Plant Health

Stress tolerance, resistance notes, and the most common problems to watch for as plants mature.

Tolerance
Heat: Low Cold: Moderate Drought: Low
Feeding & picking

Nutrition & Harvest

How hungry the plant is, what ripe harvest looks like, and how long the crop keeps after picking.

Feeding
Nutrition
Feeding intensityLight feeder
RecipesFish Emulsion
Timing
Harvest

Harvest outer leaves at 4-6" height. Cut-and-come-again. For coriander seed, allow to flower and dry (~120 days).

Storage7 days — Damp paper towel in bag, refrigerated. Flavor fades dried — add fresh before serving. Freezes well in ice cube trays.
Plant relationships

Companion Planting

Helpful neighbors can support growth or deter pests. Keep antagonistic plants separated to reduce stress and competition.

Avoid planting near
Herb Fennel Dill
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What you'll need

Growing Supplies

Based on Calypso Cilantro's growth profile -- recommendations matched to this variety's specific requirements.

Mulch / landscape fabric

Nearly every garden benefits from mulch for weed suppression, moisture conservation, and soil temperature moderation. For most home gardeners, quality organic mulch is the better buy over landscape fabric.

Source: Penn State Extension; Wisconsin Horticulture; Illinois Extension

Drip irrigation / soaker hose kit

Every gardener benefits from putting water at the root zone instead of on the leaves, because drip and soaker systems reduce foliar disease pressure by limiting leaf wetness and soil splash. A quality kit should include a backflow preventer, filter, pressure reducer, and UV-resistant tubing.

Source: Iowa State University Extension; Colorado State University Extension; UMass Extension

Garden shade cloth

K-State Research and Extension and University of Maryland Extension recommend shade cloth as a heat-management tool for vegetable gardens, with 30 percent shade rating most effective for tomatoes, peppers, and fruiting crops, and 40 to 50 percent for protecting heat-sensitive greens during hot summer months. University of Delaware research found 30 percent black shade cloth tripled marketable yield for bell peppers compared to unshaded plants, and Purdue trials showed shade cloth reduced maximum daily temperatures by 8 to 10 degrees Fahrenheit. Choose knitted polyethylene with reinforced grommets every 18 to 24 inches, mount on hoops or a frame with open sides for airflow, and remove or vent during prolonged wet weather to avoid increased humidity in the canopy.

Source: K-State Research and Extension; University of Maryland Extension; University of Delaware Cooperative Extension; Purdue University Extension

Reflective plastic mulch (white-on-black or silver)

North Carolina State Extension reports that white-on-black plastic mulch can reduce soil temperature by 5 to 20 degrees Fahrenheit and silver mulch by about 6 degrees, the opposite effect of black mulch which warms soil. This makes reflective mulch the appropriate plasticulture choice for hot zones (especially Zone 9a desert and other high-heat low-humidity areas) where overheating limits warm-season crop performance more than cold soil. Silver mulch adds documented aphid and thrips repellency from the reflective surface. Use only with drip irrigation installed underneath, never use plastic mulch without irrigation, and reserve for late spring or early fall plantings where the surrounding heat is the primary stress.

Source: North Carolina State Extension; University of Arizona Cooperative Extension

Soil test kit

A soil test gives a baseline for pH and nutrient status so gardeners can add only what the soil actually needs. Prioritize a mail-in or lab-affiliated kit whenever possible because extension guidance notes that laboratory testing is more accurate than instant readers.

Source: University of Maryland Extension; Purdue Extension; Montana State University Extension

Soil thermometer

University of Minnesota Extension recommends measuring soil temperature 2 to 4 inches below the surface to decide when warm-season crops can actually be planted, because air temperature and average frost dates do not reliably predict whether soil is warm enough for germination. A dedicated soil thermometer with a 4 to 6 inch stainless steel probe gives gardeners a deterministic reading instead of relying on the calendar alone, which matters most in zones with wide last-frost variability. Look for a waterproof stainless steel stem, a clearly marked vegetable-garden temperature range, and a readable analog or digital display at planting depth.

Source: University of Minnesota Extension

Soil moisture meter (root-zone probe)

University of Arizona Cooperative Extension notes that most vegetables root in the top 12 to 24 inches of soil and that hot, dry periods require more frequent irrigation, but watering by habit often wets only the top inch while leaving the root zone dry. A dedicated soil moisture meter with a long probe gives gardeners a deterministic reading at root depth instead of guessing from surface appearance, which is most critical in low-rainfall desert zones (Zone 9a Phoenix) and in raised beds or containers that dry from the top down. Look for a single-purpose moisture meter (not a 3-in-1 or 4-in-1 combo, which trade accuracy for feature count) with a probe that reaches 8 to 12 inches and a clear analog or digital display.

Source: University of Arizona Cooperative Extension

Storm tie-downs and ground anchors

UF/IFAS Extension and Texas A&M AgriLife Extension recommend securing or removing trellises, shade cloth, hoop covers, container plants, and lightweight raised-bed accessories before tropical storms and hurricanes, since loose garden items become projectiles in high winds. Most-relevant for Gulf Coast Zone 8b (Houston, Mobile, New Orleans), Florida Zone 9b (Miami, Tampa), and any coastal area within the Atlantic and Gulf hurricane corridors. Galvanized steel ground anchors resist rust in humid coastal soils, and screw-in spiral anchors hold significantly better than driven stakes in saturated soil during storm conditions. Use quick-release fasteners on shade cloth and trellises so they can be removed quickly when a storm watch is issued.

Source: UF/IFAS Extension; Texas A&M AgriLife Extension

Quality bypass pruners

Extension guidance favors bypass designs because they make cleaner, closer cuts on living tissue than anvil types. Look for hardened steel blades that can be sharpened, a comfortable grip, and a cutting capacity matched to real home-garden stems.

Source: University of New Hampshire Extension; Iowa State University Extension; Purdue University Extension

Raised bed kit

Raised beds improve drainage, let gardeners control soil from day one, reduce compaction, and make gardening more accessible. A quality kit should use rot-resistant, food-safe materials and provide enough depth for productive rooting.

Source: Penn State Extension; University of Delaware Cooperative Extension; Illinois Extension

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Research

Sources

Reference material and extension guidance used to build this growing guide.

seed_catalog Johnny's Selected Seedsseed_catalog West Coast Seedsseed_catalog Territorial Seedseed_catalog Burpeeseed_catalog Veseysuniversity Illinois Extension — Cilantro
Internal links

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