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Agastache mexicana (Giant Hyssop) Lavender Blue

Price range: £1.59 through £11.99

Agastache mexicana (Giant Hyssop) ‘Lavender Blue’ is a perennial with tall spikes of fragrant lavender-blue flowers above aromatic foliage. Ideal for borders, cottage gardens, or pollinator-friendly plantings.

SKU: rng_GIANT HYSSOP - AGASTACHE MEXICANA - LAVENDER BLUE Categories: , , ,
  1. Start the seeds indoors from January-April.
  2. Sow the seeds thinly on the surface of moist seed compost and lightly cover.
  3. Keep at a temperature of 20-21c until germination occurs.
  4. Seeds will usually germinate within 14-21 days.
  5. Once seedlings are large enough to handle, transplant them into individual pots.
  6. Grow on in bright light, keeping the compost moist.
  7. Gradually acclimatise the plants to outdoor conditions before planting out.
  8. Plant out after the risk of frost has passed into their final flowering position.
  9. Space plants about 30-40 cm apart in borders or beds.
  10. Water regularly during dry spells until established, but avoid waterlogging.

Name: Agastache mexicana (Giant Hyssop) Lavender Blue
Genus: Agastache
Species: mexicana
English Name: Giant Hyssop
Hardiness: Hardy
Lifecycle: Perennial
Sowing Months: Jan-Apr
Flowering: Jun-Oct

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2026 Premier Seeds Direct

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