Signet Marigold Lemon Gem - Tagetes tenuifolia
Signet Marigold Lemon Gem - Tagetes tenuifolia
Tagetes tenuifolia Lemon Gem
Border of Gold
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Description
Signet marigold 'Lemon Gem' is an adorable variety that forms neat, rounded cushions of light, feathery leaves. From summer through till autumn, it is smothered in small, shiny lemon-yellow flowers. Unfazed by grey, rainy weather, this little gem is ideal for highlighting the edges of pathways or lawns.
Tagetes tenuifolia, commonly known as Signet marigold, is a tender herbaceous annual that belongs to the Asteraceae family. It is native to the valleys of South America where it occurs naturally on dry, hot, rocky slopes. It is not cold hardy and is generally treated as an annual in colder climates. 'Lemon Gem' quickly forms tidy, bushy clumps, about 25 cm tall and wide. They are covered with mid-green, finely divided leaves that are mildly scented. The flowering period lasts from late June to October, providing spent flowers are removed regularly. This variety features single flowerheads that measure 2-3 cm in diameter. They are composed of 5 wide, bright lemon-yellow ray flowers around a central golden yellow disc. Signet marigolds self-seed easily however they are not always true to type.
Signet marigolds are star plants in summer flower beds. Brightly coloured and cheerful with a tidy habit, easy to grow and floriferous, they are ideal for borders and window boxes. They can be planted in small patches alongside grey-leaved mugwort and stachys, green-leaved tansies or Kochia Childsii, or small ornamental grasses which will soften their flamboyant colours. Their orange, yellow or red blooms mix well with blue-flowering catmints or perennial flax. Signet marigold can be also be used in potpourris, for their rather pungent lemony scent.
Good to know: Tagetes tenuifolia has intensely aromatic leaves and the substances secreted by their roots repel various harmful insects, making them an excellent companion plant in the vegetable garden. Tagetes tenuifolia was once used by the Mayas of Guatemala for its medicinal properties, particularly for relieving upset stomachs. However, it should not be used during pregnancy or breastfeeding.
Flowering
Foliage
Plant habit
Botanical data
Tagetes
tenuifolia
Lemon Gem
Asteraceae
Border of Gold
Cultivar or hybrid
Planting and care
Sowing:
Sow your 'Lemon Gem' marigold seeds from February to April.
Sow on the surface of a special sowing compost, moist and well-draining. Cover the seeds with a very thin layer of vermiculite or compost. Place the sowings in a mini greenhouse or enclose them in a polyethylene bag at a constant temperature of 20 to 25° until germination, which usually takes 7 to 21 days. Do not deprive them of light, as this promotes germination.
When the young plants are large enough to handle, transplant them into trays or 8 cm pots. Acclimate them to cooler conditions for 10 to 15 days before planting them outside at a spacing of 15 - 20 cm as soon as the risk of frost has passed.
Cultivation:
These fast-growing plants thrive in sunny and warm conditions. Plant them in fertile, well-draining, and light soil. Avoid excessive watering in summer, as it promotes the development of fungal diseases and root rot. Regularly remove faded flowers to prolong the flowering period. Protect the plants from slugs and snails, as they are fond of them. Tagetes tenuifolia is not frost tolerant.
Sowing period
Intended location
Planting & care advice
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Hardiness is the lowest winter temperature a plant can endure without suffering serious damage or even dying. However, hardiness is affected by location (a sheltered area, such as a patio), protection (winter cover) and soil type (hardiness is improved by well-drained soil).
In temperate climates, pruning of spring-flowering shrubs (forsythia, spireas, etc.) should be done just after flowering.
Pruning of summer-flowering shrubs (Indian Lilac, Perovskia, etc.) can be done in winter or spring.
In cold regions as well as with frost-sensitive plants, avoid pruning too early when severe frosts may still occur.
The harvesting period indicated on our website applies to countries and regions in USDA zone 8 (France, England, Ireland, the Netherlands).
In colder areas (Scandinavia, Poland, Austria...) fruit and vegetable harvests are likely to be delayed by 3-4 weeks.
In warmer areas (Italy, Spain, Greece, etc.), harvesting will probably take place earlier, depending on weather conditions.
The sowing periods indicated on our website apply to countries and regions within USDA Zone 8 (France, UK, Ireland, Netherlands).
In colder areas (Scandinavia, Poland, Austria...), delay any outdoor sowing by 3-4 weeks, or sow under glass.
In warmer climes (Italy, Spain, Greece, etc.), bring outdoor sowing forward by a few weeks.
The planting period indicated on our website applies to regions in USDA Zone 9a (East Coast and Midlands: Dublin, Wexford, Waterford, Kilkenny, Portlaoise). It will vary depending on where you live:
- On the west coast and in the north-west (Galway, Limerick, Sligo, Donegal, Westport), delay planting by 1 to 2 weeks in spring and bring it forward by 1 to 2 weeks in autumn compared to the dates given, preferably choosing periods without strong winds.
- In the inland hills and plateaus (Wicklow Mountains, Macgillycuddy’s Reeks, Connemara, Killarney), it is best to plant in spring (April–May) or autumn (September–October), avoiding periods of waterlogged soil in winter and strong winds, which pose the main risk to newly planted trees in these areas.
The flowering period indicated on our website applies to regions in USDA Zone 9a, such as the East Coast and Midlands, including Dublin, Wexford, Waterford, Kilkenny and Portlaoise.
This will vary depending on where you live:
- On the west coast and in the northwest (Galway, Limerick, Sligo, Donegal and Westport), it will be delayed by one to two weeks compared to the given dates, due to stronger Atlantic winds and less spring sunshine.
- In the inland hills and plateaus (the Wicklow Mountains, the Macgillycuddy's Reeks, Connemara and Killarney), flowering will be delayed by two to three weeks. Flowering mainly occurs between May and July, with the limiting factors being less frost and more of the excessive humidity, strong winds and lack of sunshine that are characteristic of these areas.
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