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General Information

Plant Care Instructions By Lucy Warren

Is Indoor Plant?

No

These month by month plant care tasks are for plants in the following zones :
Sunset Zones : 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45
USDA Zones : 1, 2a, 2b, 3a, 3b, 4a, 4b, 5a, 5b, 6a, 6b, 7a, 7b, 8a, 8b, 9a, 9b, 10a, 10b, 11, 12
Web Link - For more information

Plant Care Instruction

  • Scroll down or click on any month for plant care instructions
    • January
    • February
    • March
    • April
    • May
    • June
    • July
    • August
    • September
    • October
    January
    1. Propagate

    Start seeds indoors.
    February
    1. Buy

    Dahlia tubers come into the nurseries in the late winter to spring. Buy them when you see the varieties you like.
    2. Propagate

    Start seeds indoors.
    March
    1. Buy

    Dahlia tubers come into the nurseries in the late winter to spring. Buy them when you see the varieties you like.
    2. Plant

    Plant when danger of frost is past and the soil has warmed. About two weeks prior to planting, prepare soil by digging to about one foot and incorporating organic matter and fertilizer. Insert stakes for tall varieties.
    3. Sow Seeds

    While most people plant tubers, you can sow seed. Start seeds early indoors. Wait until after danger of frost is past to transplant seedlings in the garden.
    4. Fertilize

    Use about 1/4 cup low nitrogen fertilizer in the planting hole when you put in the plant. As dahlias are grown seasonally, they need to have the fertilizer readily available to the roots.
    5. Water

    Dahlias need regular water throughout the growing season.
    6. Prune

    Especially on tall dahlias, thin or pinch back all but the one or two strongest shoots when plant is young for best blossoms.
    7. Mulch

    Use mulch to retain moisture around the roots. Best if applied just after transplanting. or when the plants begin to grow.
    8. Transplant

    Transplant seed grown plants after danger of frost when plant is no less than 4 inches tall.
    9. Propagate

    Start seeds indoors.
    April
    1. Buy

    Dahlia tubers come into the nurseries in the late winter to spring. Buy them when you see the varieties you like.
    2. Plant

    Plant when danger of frost is past and the soil has warmed. About two weeks prior to planting, prepare soil by digging to about one foot and incorporating organic matter and fertilizer. Insert stakes for tall varieties.
    3. Sow Seeds

    While most people plant tubers, you can sow seed. Start seeds early indoors. Wait until after danger of frost is past to transplant seedlings in the garden.
    4. Fertilize

    Use about 1/4 cup low nitrogen fertilizer in the planting hole when you put in the plant. As dahlias are grown seasonally, they need to have the fertilizer readily available to the roots.
    5. Water

    Dahlias need regular water throughout the growing season.
    6. Prune

    Especially on tall dahlias, thin or pinch back all but the one or two strongest shoots when plant is young for best blossoms.
    7. Mulch

    Use mulch to retain moisture around the roots.
    8. Transplant

    Transplant seed grown plants after danger of frost when plant is no less than 4 inches tall.
    May
    1. Buy

    Dahlia tubers come into the nurseries in the late winter to spring. Buy them when you see the varieties you like.
    2. Plant

    Plant when danger of frost is past and the soil has warmed. About two weeks prior to planting, prepare soil by digging to about one foot and incorporating organic matter and fertilizer. Insert stakes for tall varieties.
    3. Sow Seeds

    While most people plant tubers, you can sow seed. Start seeds early indoors. Wait until after danger of frost is past to transplant seedlings in the garden.
    4. Fertilize

    Use about 1/4 cup low nitrogen fertilizer in the planting hole when you put in the plant. As dahlias are grown seasonally, they need to have the fertilizer readily available to the roots.
    5. Water

    Dahlias need regular water throughout the growing season.
    6. Prune

    Especially on tall dahlias, thin or pinch back all but the one or two strongest shoots when plant is young for best blossoms.
    7. Mulch

    Use mulch to retain moisture around the roots.
    8. Transplant

    Transplant seed grown plants after danger of frost when plant is no less than 4 inches tall.
    June
    1. Water

    Dahlias need regular water throughout the growing season.
    2. Mulch

    Use mulch to retain moisture around the roots.
    July
    1. Water

    Dahlias need regular water throughout the growing season.
    2. Mulch

    Use mulch to retain moisture around the roots.
    August
    1. Water

    Dahlias need regular water throughout the growing season.
    2. Mulch

    Use mulch to retain moisture around the roots.
    September
    1. Water

    Dahlias need regular water throughout the growing season.
    2. Propagate

    Dig tubers after plant has died back for the season. Store in a cool, dry place, divide to individual tubers before planting.
    October
    1. Propagate

    Dig tubers after plant has died back for the season. Store in a cool, dry place, divide to individual tubers before planting.
  • 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!

    February

    Dahlia tubers come into the nurseries in the late winter to spring. Buy them when you see the varieties you like.

    March

    Dahlia tubers come into the nurseries in the late winter to spring. Buy them when you see the varieties you like.

    April

    Dahlia tubers come into the nurseries in the late winter to spring. Buy them when you see the varieties you like.

    May

    Dahlia tubers come into the nurseries in the late winter to spring. Buy them when you see the varieties you like.

    Plant

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

    March

    Plant when danger of frost is past and the soil has warmed. About two weeks prior to planting, prepare soil by digging to about one foot and incorporating organic matter and fertilizer. Insert stakes for tall varieties.

    April

    Plant when danger of frost is past and the soil has warmed. About two weeks prior to planting, prepare soil by digging to about one foot and incorporating organic matter and fertilizer. Insert stakes for tall varieties.

    May

    Plant when danger of frost is past and the soil has warmed. About two weeks prior to planting, prepare soil by digging to about one foot and incorporating organic matter and fertilizer. Insert stakes for tall varieties.

    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?

    March

    While most people plant tubers, you can sow seed. Start seeds early indoors. Wait until after danger of frost is past to transplant seedlings in the garden.

    April

    While most people plant tubers, you can sow seed. Start seeds early indoors. Wait until after danger of frost is past to transplant seedlings in the garden.

    May

    While most people plant tubers, you can sow seed. Start seeds early indoors. Wait until after danger of frost is past to transplant seedlings in the garden.

    Fertilize

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

    March

    Use about 1/4 cup low nitrogen fertilizer in the planting hole when you put in the plant. As dahlias are grown seasonally, they need to have the fertilizer readily available to the roots.

    April

    Use about 1/4 cup low nitrogen fertilizer in the planting hole when you put in the plant. As dahlias are grown seasonally, they need to have the fertilizer readily available to the roots.

    May

    Use about 1/4 cup low nitrogen fertilizer in the planting hole when you put in the plant. As dahlias are grown seasonally, they need to have the fertilizer readily available to the roots.

    Water

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

    March

    Dahlias need regular water throughout the growing season.

    April

    Dahlias need regular water throughout the growing season.

    May

    Dahlias need regular water throughout the growing season.

    June

    Dahlias need regular water throughout the growing season.

    July

    Dahlias need regular water throughout the growing season.

    August

    Dahlias need regular water throughout the growing season.

    September

    Dahlias need regular water throughout the growing season.

    Prune

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

    March

    Especially on tall dahlias, thin or pinch back all but the one or two strongest shoots when plant is young for best blossoms.

    April

    Especially on tall dahlias, thin or pinch back all but the one or two strongest shoots when plant is young for best blossoms.

    May

    Especially on tall dahlias, thin or pinch back all but the one or two strongest shoots when plant is young for best blossoms.

    Mulch

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

    March

    Use mulch to retain moisture around the roots. Best if applied just after transplanting. or when the plants begin to grow.

    April

    Use mulch to retain moisture around the roots.

    May

    Use mulch to retain moisture around the roots.

    June

    Use mulch to retain moisture around the roots.

    July

    Use mulch to retain moisture around the roots.

    August

    Use mulch to retain moisture around the roots.

    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?

    March

    Transplant seed grown plants after danger of frost when plant is no less than 4 inches tall.

    April

    Transplant seed grown plants after danger of frost when plant is no less than 4 inches tall.

    May

    Transplant seed grown plants after danger of frost when plant is no less than 4 inches tall.

    Propagate

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

    January

    Start seeds indoors.

    February

    Start seeds indoors.

    March

    Start seeds indoors.

    August

    Dig tubers after plant has died back for the season. Store in a cool, dry place, divide to individual tubers before planting.

    September

    Dig tubers after plant has died back for the season. Store in a cool, dry place, divide to individual tubers before planting.

    October

    Dig tubers after plant has died back for the season. Store in a cool, dry place, divide to individual tubers before planting.

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About the Author
Lucy
Author: Lucy
Lucy Warren is a longtime regional gardening professional in southern California. She has written for many local and national publications, including a regular gardening column in the San Diego Union-Tribune. She has also been editor for California Garden magazine. She is a life-member of the San Diego Horticulture Society, a UCCE Master Gardener, and a horticulture chair on the board of Friends of Balboa Park. She is a sought-after speaker and expert on native plants and sustainable landscaping.
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