How to Grow Signet Marigolds UK
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In the UK, signet marigolds go in the ground early March to late March.
Timing is the decision that matters most in the UK: sowing early March, and that same window applies across all 4 regions covered here.
The short answer
- Plant
- Early March to late March
- Biggest risk
- Grey mould
Core growing advice on this page is checked against named horticultural sources — see References.
Signet Marigold (Tagetes tenuifolia)
2 sources cited · Verified
Regional Planting Calendar
| Region | Sow |
|---|---|
| Southern England | early March to late March |
| Midlands | early March to late March |
| Northern England | early March to late March |
| Scotland | early March to late March |
Southern England - detail & sources
PFAF states seed is sown in a greenhouse in March, with seedlings transplanted out after the last expected frost; applied as one UK-wide indoor-sowing window across all four sub-regions.
Midlands - detail & sources
PFAF states seed is sown in a greenhouse in March, with seedlings transplanted out after the last expected frost; applied as one UK-wide indoor-sowing window across all four sub-regions.
Northern England - detail & sources
PFAF states seed is sown in a greenhouse in March, with seedlings transplanted out after the last expected frost; applied as one UK-wide indoor-sowing window across all four sub-regions.
Scotland - detail & sources
PFAF states seed is sown in a greenhouse in March, with seedlings transplanted out after the last expected frost; applied as one UK-wide indoor-sowing window across all four sub-regions.
Quick Facts
At a Glance
Soil & Growing Conditions
Growth Stages
Harvest & Storage
Diseases
Pests
Signet Marigold Photo Gallery
Plan your Signet Marigolds planting
When to sow and plant Signet Marigolds depends on your own frost dates. Check the UK vegetable planting calendar. 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.
References
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Annual, USDA zones 2-11, UK hardy zone 3. 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.
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Annuals or perennials, upright growth, strongly aromatic pinnately divided leaves, daisy-like single or double flower-heads in summer and autumn. Family Asteraceae, not native to GB/Ireland. Page carries limited further growing detail (no soil/sun/hardiness/pest data provided).
2 independent sources are cited for this crop. Where they disagree - soil pH is the clearest case - every figure is preserved rather than averaged into false precision.
Frequently Asked Questions
When should I sow signet marigolds in the UK?
In Southern England, from early March. In Scotland, wait until early March. Treat these as a guide rather than a fixed date — the governing rule is to sow only once frost risk has passed and temperatures are reliably warm enough.
When do I sow signet marigolds?
Sow early March to late March.
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
Most of the advice on this page comes down to timing and spacing — sowing at the right moment, rotating beds, and giving plants enough airflow. The UK Garden Planner lays your plot out month by month so those decisions are already made before the season starts.
Get the UK Garden Planner →Instant PDF download · Written for UK growing conditions
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 RHS and Met Office guidance. 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.
Related Problem Guides
Last verified 2026-09-03
Plan Signet Marigolds by month
The months this guide gives for sowing or planting, each with the full list of jobs for that month in the UK:
More from the same group (herbs & aromatics):
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.