Red Giant Mustard Seeds


The Asian heirloom Red Giant mustard grows faster and packs a more pungent punch than mustard greens traditionally grown in the southern regions of North America. Red Giant mustard is native to Japan, where it’s a staple crop revered for its signature wasabi flavour.

Shooting up to 40 cm in height, Red Giant is both cold tolerant and bolt resistant. It can grow straight through a mild winter and withstand hot temperatures. Conspicuous, gargantuan leaves boast deep purple hues to shades of maroon atop prominent green stems. Many gardeners report they even grow it as an ornamental, due to the striking appearance of the Red Giant leaves. 

A fiery hot horseradish flavour can be expected from the abundance of gigantic leaves Red Giant offers. The size and flavour lends well to being pickled, steamed, cooked in a stew or simply eaten raw. Red Giant is a cut and come again crop that can be harvested consistently over the course of a long season. Spice enthusiasts should know that larger, older leaves will contain more concentrated levels of heat. 


- Latin Name: Brassica juncea
- Life Cycle: Annual
- Days to Maturity: 45
- Planting Depth: 5 mm
- Plant Spacing: 15 cm
- Growth Habit: 30-60 cm tall


The name of the popular condiment actually comes from a broad leafy green vegetable. Mustard, a relative of cruciferous vegetables like broccoli, cauliflower, cabbage and kale, enjoys the same cool weather conditions as its wholesome family members.

Start seeds, inside or out, 3 weeks before the last frost date. They should be lightly covered with soil, and planted about 2 cm apart. After sprouting, thin to 10-15 cm apart. Plantings can be made every few weeks in spring, and again in midsummer, to enjoy continual harvests throughout the year. Timing is important though, mustard should be ready to harvest anywhere from 40-60 days, but will not grow well during the hottest summer months.

Cut the tender new growth for fresh eating, larger leaves begin to get tough and will require some form of cooking. Choose a site with rich, well-drained soil that receives full sun. Mustard will require about 5 cm of water per week. Keep the soil moist and watch the towering foliage thrive.

Other than that, these greens won’t require too much attention or maintenance. The flowers make a pretty, edible garnish. And when the seed pods turn from green to brown, be sure to collect them, lest they break open and sow seeds all over the garden. The seeds are very useful in the kitchen, great for batches of pickles, relishes or dressings. Ground them down and make your own specialty mustard!


- All parts of the mustard plant are edible: the seeds, the leaves and flowers.

- Mustard seeds will remain viable for 4 years if stored in a cool, dark place, ideally between 4 and 10⁰C. After that, the germination rate may start to go down.

Notre garantie sur les semences

Vous savez qu'un jardin luxuriant et fructueux a besoin d'un bon sol, d'arrosages fréquents et du soleil pour pousser, mais ce sont les semences qui font vraiment la différence.

Cueillies et ensachées pour 2024, la grande majorité de nos semences ont des taux de germination de plus de 85 %. Toutes nos semences sont entièrement naturelles, sans OGM, non hybrides, non traitées et à pollinisation libre pour récolter les semences année après année.

Nos semences sont  soigneusement emballées dans des pochettes refermables, en papier kraft/aluminium de qualité alimentaire. Nos commandes sont ensuite expédiées dans des enveloppes rembourrées respectueuses de l'environnement.

Nous utilisons un scellage thermique pour chaque sachet de graines afin de garantir une protection maximale contre l'humidité , les odeurs et la lumière, vous permettant de conserver vos semences jusqu'à 3 fois plus longtemps que dans du papier ou plastique. Plantez-les toutes, faites-en germer quelques-unes à l'intérieur, gardez-en pour la saison prochaine - à vous de décider !