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Nepeta subsessilis Dark Blue Panther - Catnip

Nepeta subsessilis Dark Blue Panther
Japanese Catmint, Japanese Nepeta

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More information

A high-performing variety, awarded a bronze medal at the prestigious Dutch Planetarium competition for its ornamental qualities and floribundus. The Panther series varieties flower 15 weeks after sowing. This neckless subsessile is a perennial more suited to heavy soils and cool environments. The flowering is of an intense dark purple-blue. Stems, leaves, and flowers are aromatic when crushed.
Flower size
1 cm
Height at maturity
30 cm
Exposure
Sun
Annual / Perennial
Perennial
Germination time (days)
14 days
Sowing method
Direct sowing, Sowing under cover
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Sowing period March to April
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Flowering time June to September
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Description

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The Nepeta subsessilis 'Dark Blue Panther', also known as subsessile catmint, is a fast-flowering perennial with a bushy, erect, and well-branched habit, featuring broad light green aromatic leaves. Its dense and compact foliage forms a dome covered with large spikes of dark bluish-purple, wide, and fragrant flowers from the first summer. Preferring cool environments and heavy soils, the Nepeta subsessilis is ideal for borders, beds, or pots, thriving in sunny exposure. This variety starts flowering only 15 weeks after sowing.

The Nepeta subsessilis belongs to the Lamiaceae family. This perennial species is native to the moist mountain slopes of Asia. 'Dark Blue Panther' is a horticultural selection. The plant forms, from spring, a dense and bushy clump of 30 cm in height, spreading about 40 cm; it quickly spreads through its rhizomes. Flowering begins in June and continues until September. The flowers, clustered in dense spikes, are dark bluish-purple and measure 3 cm in length. Very melliferous, fragrant, they attract a large number of bees and butterflies. The foliage is medium green, and the leaves are very aromatic when crushed. They are ovate, toothed, glabrous, and measure 8 to 10 cm in length. It is one of the species most able to withstand high atmospheric humidity. Also known as Catmint, its leaves are attractive to these small felines.

The Nepeta subsessilis 'Dark Blue Panther' is an easy-to-grow plant, thriving ideally in cool, rich soil in sunny exposure. Although it tolerates dry, poor, and rocky soils, its flowering will be less generous in these conditions. Less drought-resistant than other Nepeta varieties, it, however, adapts better to heavy soils. Used in border plantings, on slopes, or in containers, the Nepeta subsessilis lends itself to charming combinations with roses to create a romantic atmosphere, or with perennials with yellow or orange flowers for a striking contrast, such as Achillea 'Terracotta', Coreopsis, or Rudbeckias. It also pairs very well with Lobelias and Chelone, and its bluish-purple flowering complements the intense blue of Salvia guaranitica. In heavy, moist soil, pair it with Salvia uliginosa with celestial blue flowers.

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Flowering

Flower colour blue
Flowering time June to September
Inflorescence Cluster
Flower size 1 cm
Fragrance Fragrant, Powerful scent combining lemongrass and mint.
Bee-friendly Attracts pollinators

Foliage

Foliage persistence Semi-evergreen
Foliage colour green
Aromatic? Fragrant foliage when creased
Foliage description Strong scent combining lemon balm and peppermint.

Plant habit

Height at maturity 30 cm
Spread at maturity 40 cm
Growth rate normal

Botanical data

Genus

Nepeta

Species

subsessilis

Cultivar

Dark Blue Panther

Family

Lamiaceae

Other common names

Japanese Catmint, Japanese Nepeta

Origin

Cultivar or hybrid

Product reference20496

Planting and care

Indoor Sowing

Sow Nepeta subsessilis Dark Blue Panther from spring to autumn in a moist potting mix, barely covering the seeds. Keep the compost surface moist but not waterlogged. Germination usually takes 7 to 21 days at 16-20 °C.

Once the young plants are sufficiently developed, transplant them into 7.5 cm pots or trays. Gradually acclimate the plants to cooler conditions for a few days before placing them outdoors, after all risk of frost, spacing them 30 cm apart. Choose a sunny location.

Direct Sowing

Sow in spring or early summer, after all risk of frost has passed.
Seeds can be sown outside directly where they are to flower. They can be sown thinly or in more formal beds and borders.
Sow seeds in short rows from March to May, at temperatures around 20°C. Lightly cover with soil.
Seeds will germinate in two to three weeks. Thin out the seedlings to 30 cm apart by early summer. Keep the compost slightly moist, but not constantly wet.

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Sowing period

Sowing period March to April
Sowing method Direct sowing, Sowing under cover
Germination time (days) 14 days

Intended location

Suitable for Meadow, Rockery
Type of use Border, Edge of border, Container, Slope, Vegetable garden
Hardiness Hardy down to -18°C (USDA zone 7a) Show map
Ease of cultivation Amateur
Exposure Sun
Soil pH Any
Soil moisture Moist soil

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