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Swamp milkweed
Plant Care Instructions By Rhonda Hayes

Swamp milkweed, Asclepias incarnata is a resilient, adaptable native plant for perennial gardens, butterfly gardens and rain gardens. This milkweed prefers medium to wet soils. It grows from 3-4 feet tall in part to full sun. The beautiful pink flower clusters appear in June to July and continue until early fall. Swamp milkweed is a valuable larval plant host for the Monarch butterfly.

Is Indoor Plant?

No

These month by month plant care tasks are for plants in the following zones :
Sunset Zones :
USDA Zones : 4a, 4b, 5a, 5b, 6a, 6b
Web Link - For more information
Scroll down or click on any month for plant care instructions
  • Jan
  • Feb
  • Mar
  • Apr
  • May
  • Jun
  • Jul
  • Aug
  • Sep
  • Oct
  • Nov
  • Dec
  • January
    • February
      • Sow Seeds

          To start by seed outdoors requires pre-chilling. Refrigerate for 3 weeks prior to sowing. Barely cover with soil and keep moist.

    • March
      • Buy

          Container grown Swamp Milkweed becomes available when garden center perennial stock appears.

      • Plant

          Swamp milkweed can be planted in early spring when a light frost is expected, and then through spring to early summer.

      • Sow Seeds

          To start by seed outdoors requires pre-chilling. Refrigerate for 3 weeks prior to sowing. Barely cover with soil and keep moist.

    • April
      • Buy

          Container grown Swamp Milkweed becomes available when garden center perennial stock appears.

      • Plant

          Swamp milkweed can be planted in early spring when a light frost is expected, and then through spring to early summer.

      • Sow Seeds

          To start by seed outdoors requires pre-chilling. Refrigerate for 3 weeks prior to sowing. Barely cover with soil and keep moist.

      • Prune

          For bushier plants, pinch plant tips. This technique can be used to keep plants shorter and more manageable. Note that pinching more than once can delay bloom.

    • May
      • Buy

          Container grown Swamp Milkweed becomes available when garden center perennial stock appears.

      • Plant

          Swamp milkweed can still be planted in late spring and then through early summer. Take care to water regularly until plant is established.

      • Fertilize

          Swamp milkweed requires little fertilizer, if any. When grown in beds with other perennials, some fertilizer will not harm the plant.

      • Water

          Water well until established. Established plants can withstand dry spells, but the plant will do best with moist to wet soils.

      • Prune

          For bushier plants, pinch plant tips. This technique can be used to keep plants shorter and more manageable. Note that pinching more than once can delay bloom.

    • June
      • Buy

          Container grown Swamp Milkweed becomes available when garden center perennial stock appears.

      • Plant

          Swamp milkweed can still be planted in late spring and then through early summer. Take care to water regularly until plant is established.

      • Fertilize

          Swamp milkweed requires little fertilizer, if any. When grown in beds with other perennials, some fertilizer will not harm the plant.

      • Water

          Water well until established. Established plants can withstand dry spells, but the plant will do best with moist to wet soils.

      • Mulch

          Mulch during these months to help to conserve soil moisture that swamp milkweed prefers.

      • Pest/Disease Inspection

          Watch out for aphids. Otherwise swamp milkweed is relatively pest-free.

    • July
      • Fertilize

          Swamp milkweed requires little fertilizer, if any. When grown in beds with other perennials, some fertilizer will not harm the plant.

      • Water

          Provide adequate water through hot weather.

      • Mulch

          Mulch during these months to help to conserve soil moisture that swamp milkweed prefers.

      • Pest/Disease Inspection

          Watch out for aphids. Otherwise swamp milkweed is relatively pest-free.

      • Treat for Pest/Disease

          Direct a strong hose spray towards aphids. You may want to use soapy water or horticultural soap if problem persists.

      • Propagate

          Division is not recommended due to delicate tap root. Root cuttings can be made, but propagation by seed is preferable.

    • August
      • Water

          Provide adequate water through hot weather.

      • Mulch

          Mulch during these months to help to conserve soil moisture that swamp milkweed prefers.

      • Pest/Disease Inspection

          Watch out for aphids. Otherwise swamp milkweed is relatively pest-free.

      • Treat for Pest/Disease

          Direct a strong hose spray towards aphids. You may want to use soapy water or horticultural soap if problem persists.

      • Transplant

          Transplanting is not recommended due to the delicate tap root.

      • Propagate

          Division is not recommended due to delicate tap root. Root cuttings can be made, but propagation by seed is preferable.

      • Special requirements

          Swamp milkweed can proliferate by wind-blown seeds, remove seed heads to avoid re-seeding problems.

    • September
      • Plant

          Swamp milkweed can be planted in early autumn before freezing temperatures. Take care to water regularly until ground freezes.

      • Sow Seeds

          Sow seeds outdoors before first frost. Barley cover with soil and keep moist until ground freezes. Swamp milkweed is slow to appear in spring, for this reason, mark the place well. Be patient and keep soil moist through germination and seedling growth.

      • Transplant

          Transplanting is not recommended due to the delicate tap root.

      • Propagate

          Division is not recommended due to delicate tap root. Root cuttings can be made, but propagation by seed is preferable.

      • Special requirements

          Swamp milkweed can proliferate by wind-blown seeds, remove seed heads to avoid re-seeding problems.

    • October
      • Plant

          Swamp milkweed can be planted in early autumn before freezing temperatures. Take care to water regularly until ground freezes.

      • Sow Seeds

          Sow seeds outdoors before first frost. Barley cover with soil and keep moist until ground freezes. Swamp milkweed is slow to appear in spring, for this reason, mark the place well. Be patient and keep soil moist through germination and seedling growth.

      • Special requirements

          Swamp milkweed can proliferate by wind-blown seeds, remove seed heads to avoid re-seeding problems.

    • November
      • December
        • Winter
          • Spring
            • Summer
              • Fall
                • Buy

                  When's the best time to buy this plant? When can you buy these from seed (if you can)? When is it usually available? What are things to look for when you're buying it? Or anything other tidbit of information you can share!

                  •  Jan
                  •  Feb
                  •  Mar
                  •  Apr
                  •  May
                  •  Jun
                  •  Jul
                  •  Aug
                  •  Sep
                  •  Oct
                  •  Nov
                  •  Dec
                  • March

                    Container grown Swamp Milkweed becomes available when garden center perennial stock appears.

                  • April

                    Container grown Swamp Milkweed becomes available when garden center perennial stock appears.

                  • May

                    Container grown Swamp Milkweed becomes available when garden center perennial stock appears.

                  • June

                    Container grown Swamp Milkweed becomes available when garden center perennial stock appears.

                • Plant

                  When's a good time to plant this plant or bulb? Any special planting instructions?

                  •  Jan
                  •  Feb
                  •  Mar
                  •  Apr
                  •  May
                  •  Jun
                  •  Jul
                  •  Aug
                  •  Sep
                  •  Oct
                  •  Nov
                  •  Dec
                  • March

                    Swamp milkweed can be planted in early spring when a light frost is expected, and then through spring to early summer.

                  • April

                    Swamp milkweed can be planted in early spring when a light frost is expected, and then through spring to early summer.

                  • May

                    Swamp milkweed can still be planted in late spring and then through early summer. Take care to water regularly until plant is established.

                  • June

                    Swamp milkweed can still be planted in late spring and then through early summer. Take care to water regularly until plant is established.

                  • September

                    Swamp milkweed can be planted in early autumn before freezing temperatures. Take care to water regularly until ground freezes.

                  • October

                    Swamp milkweed can be planted in early autumn before freezing temperatures. Take care to water regularly until ground freezes.

                • Sow Seeds

                  When can you plant these seeds? When's the best time? Can you start them indoors and move them out? Do they have any special requirements?

                  •  Jan
                  •  Feb
                  •  Mar
                  •  Apr
                  •  May
                  •  Jun
                  •  Jul
                  •  Aug
                  •  Sep
                  •  Oct
                  •  Nov
                  •  Dec
                  • February

                    To start by seed outdoors requires pre-chilling. Refrigerate for 3 weeks prior to sowing. Barely cover with soil and keep moist.

                  • March

                    To start by seed outdoors requires pre-chilling. Refrigerate for 3 weeks prior to sowing. Barely cover with soil and keep moist.

                  • April

                    To start by seed outdoors requires pre-chilling. Refrigerate for 3 weeks prior to sowing. Barely cover with soil and keep moist.

                  • September

                    Sow seeds outdoors before first frost. Barley cover with soil and keep moist until ground freezes. Swamp milkweed is slow to appear in spring, for this reason, mark the place well. Be patient and keep soil moist through germination and seedling growth.

                  • October

                    Sow seeds outdoors before first frost. Barley cover with soil and keep moist until ground freezes. Swamp milkweed is slow to appear in spring, for this reason, mark the place well. Be patient and keep soil moist through germination and seedling growth.

                • Fertilize

                  When should you fertilize this plant? Which kind of fertilizer do you recommend? Should you use different fertilizers at different times of year?

                  •  Jan
                  •  Feb
                  •  Mar
                  •  Apr
                  •  May
                  •  Jun
                  •  Jul
                  •  Aug
                  •  Sep
                  •  Oct
                  •  Nov
                  •  Dec
                  • May

                    Swamp milkweed requires little fertilizer, if any. When grown in beds with other perennials, some fertilizer will not harm the plant.

                  • June

                    Swamp milkweed requires little fertilizer, if any. When grown in beds with other perennials, some fertilizer will not harm the plant.

                  • July

                    Swamp milkweed requires little fertilizer, if any. When grown in beds with other perennials, some fertilizer will not harm the plant.

                • Water

                  Is there a time to reduce or increase watering? Any special requirements? Things to avoid during certain times of the year?

                  •  Jan
                  •  Feb
                  •  Mar
                  •  Apr
                  •  May
                  •  Jun
                  •  Jul
                  •  Aug
                  •  Sep
                  •  Oct
                  •  Nov
                  •  Dec
                  • May

                    Water well until established. Established plants can withstand dry spells, but the plant will do best with moist to wet soils.

                  • June

                    Water well until established. Established plants can withstand dry spells, but the plant will do best with moist to wet soils.

                  • July

                    Provide adequate water through hot weather.

                  • August

                    Provide adequate water through hot weather.

                • Prune

                  When's a good time to prune this plant? How about deadheading, pinching back, trimming or any other grooming? Any special requirements?

                  •  Jan
                  •  Feb
                  •  Mar
                  •  Apr
                  •  May
                  •  Jun
                  •  Jul
                  •  Aug
                  •  Sep
                  •  Oct
                  •  Nov
                  •  Dec
                  • April

                    For bushier plants, pinch plant tips. This technique can be used to keep plants shorter and more manageable. Note that pinching more than once can delay bloom.

                  • May

                    For bushier plants, pinch plant tips. This technique can be used to keep plants shorter and more manageable. Note that pinching more than once can delay bloom.

                • Mulch

                  Does this plant need to be mulched? Are there specific types of Mulch which are better for this plant? How much?

                  •  Jan
                  •  Feb
                  •  Mar
                  •  Apr
                  •  May
                  •  Jun
                  •  Jul
                  •  Aug
                  •  Sep
                  •  Oct
                  •  Nov
                  •  Dec
                  • June

                    Mulch during these months to help to conserve soil moisture that swamp milkweed prefers.

                  • July

                    Mulch during these months to help to conserve soil moisture that swamp milkweed prefers.

                  • August

                    Mulch during these months to help to conserve soil moisture that swamp milkweed prefers.

                • Protect

                  When and how should you protect this plant from birds, deer, rabbits? Does this plant need be covered, or wrapped or painted or moved?

                  •  Jan
                  •  Feb
                  •  Mar
                  •  Apr
                  •  May
                  •  Jun
                  •  Jul
                  •  Aug
                  •  Sep
                  •  Oct
                  •  Nov
                  •  Dec
                  • Pest/Disease Inspection

                    What are the common problems this plant will face and when should you look for them to appear?

                    •  Jan
                    •  Feb
                    •  Mar
                    •  Apr
                    •  May
                    •  Jun
                    •  Jul
                    •  Aug
                    •  Sep
                    •  Oct
                    •  Nov
                    •  Dec
                    • June

                      Watch out for aphids. Otherwise swamp milkweed is relatively pest-free.

                    • July

                      Watch out for aphids. Otherwise swamp milkweed is relatively pest-free.

                    • August

                      Watch out for aphids. Otherwise swamp milkweed is relatively pest-free.

                  • Treat for Pest/Disease

                    How do you treat the common problems for this plant? What products or concoctions or natural means do you use? Any special requirements?

                    •  Jan
                    •  Feb
                    •  Mar
                    •  Apr
                    •  May
                    •  Jun
                    •  Jul
                    •  Aug
                    •  Sep
                    •  Oct
                    •  Nov
                    •  Dec
                    • July

                      Direct a strong hose spray towards aphids. You may want to use soapy water or horticultural soap if problem persists.

                    • August

                      Direct a strong hose spray towards aphids. You may want to use soapy water or horticultural soap if problem persists.

                  • Transplant

                    When's the best time to dig up and transplant this from one spot to another? (This is different than planting). Any special requirements?

                    •  Jan
                    •  Feb
                    •  Mar
                    •  Apr
                    •  May
                    •  Jun
                    •  Jul
                    •  Aug
                    •  Sep
                    •  Oct
                    •  Nov
                    •  Dec
                    • August

                      Transplanting is not recommended due to the delicate tap root.

                    • September

                      Transplanting is not recommended due to the delicate tap root.

                  • Propagate

                    When's a good time to divide, take cuttings, layer or propagate this plant. Any special requirements?

                    •  Jan
                    •  Feb
                    •  Mar
                    •  Apr
                    •  May
                    •  Jun
                    •  Jul
                    •  Aug
                    •  Sep
                    •  Oct
                    •  Nov
                    •  Dec
                    • July

                      Division is not recommended due to delicate tap root. Root cuttings can be made, but propagation by seed is preferable.

                    • August

                      Division is not recommended due to delicate tap root. Root cuttings can be made, but propagation by seed is preferable.

                    • September

                      Division is not recommended due to delicate tap root. Root cuttings can be made, but propagation by seed is preferable.

                  • Harvest

                    When's a good time to harvest this plant? What's the best way to harvest? Are there special requirements or features?

                    •  Jan
                    •  Feb
                    •  Mar
                    •  Apr
                    •  May
                    •  Jun
                    •  Jul
                    •  Aug
                    •  Sep
                    •  Oct
                    •  Nov
                    •  Dec
                    • Special requirements

                      Any other requirement for this plant? Is there anything that doesn't fit into the other care categories?

                      •  Jan
                      •  Feb
                      •  Mar
                      •  Apr
                      •  May
                      •  Jun
                      •  Jul
                      •  Aug
                      •  Sep
                      •  Oct
                      •  Nov
                      •  Dec
                      • August

                        Swamp milkweed can proliferate by wind-blown seeds, remove seed heads to avoid re-seeding problems.

                      • September

                        Swamp milkweed can proliferate by wind-blown seeds, remove seed heads to avoid re-seeding problems.

                      • October

                        Swamp milkweed can proliferate by wind-blown seeds, remove seed heads to avoid re-seeding problems.

                    Click This Button To Use These Plant Care Reminders

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