Silphium laciniatum - Compass Plant

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    Silphium laciniatum - Compass Plant

    SKU: C18640



    This unusual plant has fleshy, deeply divided leaves that orient themselves in a north-south direction, thus the name Compass Plant. Slow-growing, but extremely long-living, some have been known to live upwards of 100 years! Well developed plants may have up to one hundred large yellow flowers blooming from June through September. The nutritious seeds of Silphium laciniatum are favoured by Goldfinches and other birds.

      Late Summer
      Full Sun
      4' - 12'
      Sand to Clay
      Dry to Medium
    Approx. 7 seeds per pack - 22 seeds per gram

    Attracts Butterflies & Songbirds!
    Deer Resistant!
    Makes Great Cut Flowers!

    All Wildflower Farm seeds are hardy through growing zone 3, organic and non-GMO.


    Indoors: Cold, moist stratification. Start at least 5 weeks before outdoor night temperatures are reliably in the 10 C (50 F) range. Mix the seed with a slightly moistened, sterile, soil-less growing mix. Put this in a labelled, sealed plastic bag and store in a refrigerator for one day. The next day place this in the freezer for one day. Repeat this for one week, alternating between the fridge and the freezer. After stratifying, plant seed 0.64 cm (1/4 inch) deep in pots. Keep moist but not soggy and very warm (21 C - 70 F). When seedlings are 5 cm (2 inches) tall or more, transplant into the garden spaced 30 cm (1 foot) apart.

    Outdoors: Plant seed 0.64 cm (1/4 inch) deep in a prepared seed bed in late fall so that the seed overwinters and germinates naturally in spring.

    Outdoors Alternative: In late fall through to mid-winter fill plastic pots with a slightly moistened, sterile, soil-less growing mix. Plant seed 0.64 cm (1/4 inch) deep in pots and label the pots. Place them outdoors in an area where they will experience the snow and cold of winter. The seed will germinate in the pots in spring as the weather warms up. Be sure to water the pots regularly in spring and once the plants are 5 cm (2 inches) tall, transplant them into your garden.