How to Grow Signet Marigolds
On this page
Signet marigolds (Tagetes tenuifolia) — Annual, USDA zones 2-11, UK hardiness zone 3 (PFAF).
Unlike an annual crop, the work here is front-loaded into establishment: get the planting and the site right and the same plants crop for several seasons.
Core growing advice on this page is checked against named horticultural sources — see References.
Signet Marigold (Tagetes tenuifolia)
2 sources cited · Verified
Soil & Growing Conditions
Growth Stages
Quick Facts
At a Glance
Harvest & Storage
Diseases
Pests
Plan your Signet Marigolds planting
Timing for Signet Marigolds follows soil temperature and frost, not the calendar date. The Global vegetable planting calendar explains the method. To work out where it fits in your beds, sketch your plot in the free Garden Layout Planner.
Growing Signet Marigold in another region
Sowing dates, frost timing and local advice differ by country. Use the guide for where you garden.
Sources
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Height/spread 0.8m. Soil: light/medium/heavy, well-drained but tolerates heavy clay, pH mildly acid/neutral/mildly alkaline. Full sun, tolerates dry and moist soil. Propagation: sow March in greenhouse, just cover seed, germinates within 2 weeks, transplant after last frost. Pests: slugs, snails, botrytis. Native to Central/South America (Mexico to Guatemala). Edible: flowers, citrus-like flavour, used sparingly as garnish/flavouring. Root secretions insecticidal against nematodes and some slugs. Produces yellow dye from flowers. Dynamic accumulator plant. Aromatic bruised foliage.
These source is specific to this region. The full list of 2 sources behind this guide (Plants For A Future (PFAF), Royal Horticultural Society) is in the references of our UK guide to signet marigolds; they describe the plant itself, which is the same wherever it grows.
Frequently Asked Questions
What problems affect signet marigolds?
Our data links 1 disease and 2 pests to this crop. See the sections above for each one and how to manage it.
Plan next season before the problems start
This page gives you the thresholds; the planner turns them into your own calendar. It works from what you can observe and measure in your garden rather than from dates written for somebody else’s latitude.
Get the Global Garden Planner →Instant PDF download · Works in either hemisphere
How this guide is put together
The growing data on this page — sowing windows, pests, diseases, soil and site requirements — comes from named horticultural sources, listed in References below, checked against international horticultural research and extension sources. An automated pipeline assembles that verified data into the page you're reading: it selects which facts to lead with and builds the surrounding prose and layout. It does not invent a date, a source or a number — where a verified value for a field isn't available, the page leaves it out rather than guessing. A person reviews and publishes each page; nothing goes live unverified.
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Last verified 2026-09-03
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Where To Go From Here
Take this crop from reading into a written plan for your own beds.
Keep going
Plan the next step
Use the printable SoilCommander planner for your region to turn this guide into sowing dates, bed layouts and weekly garden tasks.