Narrowleaf Milkweed - Asclepias fascicularis - The Living Seed Company LLC

Narrowleaf Milkweed - Asclepias fascicularis

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Narrowleaf Milkweed is a gorgeous California native flower that is the sole source of food for the Monarch butteries. The butterflies lay their eggs exclusively on Milkweed plants, creating an opportunity for us to plant Monarch habitat!

We recommend planting only milkweed plant that is native to your area.  Each region is going to have milkweed specific to its area - except the Pacific Northwest.

Reasons why planting non-native milkweed is detrimental to the Monarchs:

  • In warmer regions, where milkweed does not die back in the winter, a build-up of a debilitating protozoan parasite (Ophryocystis elektroscirrha or OE) that infects monarchs can occur.
  • Non-native milkweed presence in the fall could cause migrating monarchs to break diapause (a temporary non-reproductive state) and lay eggs instead of completing their migration to Mexico.
  • Reseeding (and invasion) of non-native milkweed species


Narrowleaf Milkweed  grows as a subshrub about 2' - 4' high with stunning fragrant flowers. These wildflowers are easy to grow and propagate through rhizomes. Known for their beautiful colors ranging in greenish white to deep purple, the Milkweed brings joy and life to every garden! Exuding a delicious vanilla scent, the milkweed also attracts other pollinators while bloom from June - August.

Also known as Mexican Whorled milkweed, this milkweed grows well in dry climates and will blossom from June - September.   This beautiful low maintenance, drought tolerant wildflower may be slow to grow the first year, as it sets its taproot deep into the earth.  In following years, it will grow more vigorous.

It is very important to plant locally native milkweed species.  Please learn which milkweeds are native to your region and consult this milkweed range maps from the Biota of North America Program’s (BONAP) North American Plant Atlas.

Support the Monarch population by planting your Milkweed seeds today!

If you live in California, this is the variety we recommend.  

California coastal gardeners are recommended to plant the milkweed 5 or more miles from the coastline, as milkweed may not have historically grown there.  Planting  closer to the coast, may lure Monarchs off of their regular migration pattern.  Some Monarchs may not have the resistance to the fungi, created by the moisture in the fog, resulting in caterpillars that are unable to survive. 

  • Non-GMO
  • Perennial 
  • Sun: Full
  • Indoors: 8 weeks before last frost
  • Direct Sow: In the fall, or in the spring after cold stratification
  • Seed Count: 30
  • Plant Size: 3'-5'
    • Ornamental
    • Attracts pollinators
    • Open Pollinated 
    • Neonicotinoid-free

    Growing Tips:

    Narrowleaf seeds must be stratified, if they are planted in the spring, for proper germination. 

    Instructions on cold stratification, to germinate seeds in the spring time.

    Plants may appear eaten, but that is the monarch caterpillars feasting. After initial blooming season, plants require minimal moisture. Fall time pruning will help it go dormant. Leave 1" stick.

    More info on how to create a monarch habitat.

    Seed Packet Instructions:

    Narrowleaf Milkweed - Asclepias fascicularis

    Consider including your garden to the Monarch Joint Venture for their monarch conservation initiatives! 

    Monarch conservation information – Xerces Society

    Report any sightings of Monarchs here

    monarch_migration_map