Sowing Guide

How to Sow Purple Giant Korean Mint Agastache Seeds

Growing Giant Purple Korean Mint Agastache Seeds

Purple Korean Mint (Agastache rugosa) is a stunning perennial that produces tall spikes of purple flowers, which can grow to over 100cm in height. With its long heritage dating back to mountainous Asian regions. This stunning multi-functional plant will add an aromatic mint scent to any space. Known for its beautiful upright flowers and culinary uses, this herbaceous plant is perfect for the rear of borders, herb gardens, and containers, indoors or outdoors. Each packet contains over 50 seeds, promising a lush and fragrant display throughout the growing season.

When to Sow Purple Korean Mint Agastache Seeds in the UK

  • Sowing Temperature: For optimal germination, maintain soil temperatures between 15-18°C (59-64°F). This temperature range ensures fast and even sprouting of seeds.
  • Soil and Location: Choose a sunny to partly shaded location with well-drained soil. Enrich the soil with organic compost to provide essential nutrients for robust growth. Purple Korean Mint thrives in full sun but can tolerate partial shade.
  • Seed Sowing Advice: Sow seeds on the soil surface or barely cover them with a thin layer of fine soil. Approximately 1/4″ deep. Keep the soil consistently moist but not waterlogged during the germination period.

Sowing Purple Korean Mint Agastache Seeds in Spring

  • Indoor Start: Sow seeds indoors or in a propagator 6-8 weeks before the last frost date. This early start helps ensure vigorous growth and early blooming.
  • Direct Sowing: Sow seeds directly outdoors in late spring, once the danger of frost has passed. Scatter the seeds thinly and press them into the soil surface lightly. Maintain soil moisture during the germination period, which typically takes 10-14 days.

Growing Purple Korean Mint Agastache in Summer

  • Transplanting: Transplant indoor-started seedlings outdoors when they are large enough to handle and after all danger of frost has passed. Space the seedlings about 30cm apart to allow for full growth.
  • Watering: Summer sowing and growing may require more frequent watering to keep the soil moist due to higher temperatures. Ensure consistent moisture, especially during dry spells.
  • Key Note: Seeds can be sown directly outdoors during summer months, providing there is sufficient sunlight & consistently warm outdoor temperatures.

Growing Purple Korean Mint Agastache in Autumn

  • Autumn Sowing: In milder UK regions, sow seeds in autumn for blooms the following spring. This method allows the seeds to overwinter in the ground, leading to early flowering.
  • Protection: Provide protection with fleece or cloches to shield young plants from severe frost. This helps ensure their survival through the winter months.

Caring for Purple Giant Korean Mint Agastache Plants & Seedlings

  • Thinning: Thin seedlings to 30cm apart to allow ample space for growth. This prevents overcrowding and ensures healthy development.
  • Watering: Keep the soil consistently moist but avoid waterlogging. Purple Korean Mint plants benefit from regular watering, especially during dry periods.
  • Companion Planting: Purple Korean Mint pairs well with other herbs and garden plants, helping to deter pests and promote a healthy garden ecosystem.
  • Weeding: Regularly weed around the plants to prevent competition for nutrients and water. Gentle hand weeding is preferred to avoid disturbing the roots.
  • Mulching: Apply a layer of organic mulch to retain soil moisture, suppress weeds, and regulate soil temperature.

Harvesting and Using Purple Korean Mint Agastache

  • Flower Harvest: For fresh arrangements, cut the flowers when they are fully open. Purple Korean Mint flowers last well in water and make beautiful additions to bouquets.
  • Culinary Use: Harvest the leaves as needed for culinary purposes. The anise-like flavor is perfect for flavoring meats, sauces, and beverages.
  • Self-Seeding: Purple Korean Mint is a prolific self-seeder. Allow some seed pods to naturally disperse for the plants to reappear the following year with minimal effort.

Frequently Bought Together

Main Menu x