Larkspur plants grow as summer annuals, producing 3- to 4-foot spires of light blue, purple, rose or white blooms. They require cool temperatures to germinate, but they cannot survive frost. Plants started from seed take approximately four months before they begin to flower, so larkspur plants grow as summer annuals. They require cool temperatures to germinate, but they cannot survive frost. Plants started from seed take approximately four months before they begin to flower, so the seeds are started in fall allowing larkspurs to establish their root systems, then spend the entire spring and summer in bloom. These flowers have a poor germination rate so plant twice as many seeds as you need for your garden to ensure enough larkspurs sprout to fill your garden bed.
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Things you need
- Potting soil
Plant the seeds 1/8 inch deep, sowing two to three seeds per pot.
Set the pots outdoors or in a 60 to 65 degree Fahrenheit room. Avoid locations where the soil freezes or where temperatures rise above 23.9 degrees Celsius.
Move pots to a full-sun location once the seeds germinate, typically within 20 days of sowing. Move outdoor pots indoors once temperatures drop below 4.44 degrees Celsius. Maintain a temperature between 21.1 and 23.8C after germination.
Thin the plants once they produce their second set of leaves. Pinch out the smaller and weaker plants in each pot so only one larkspur plant remains in the pot.
Water the larkspur plants when the soil surface begins to dry. Fertilise the plants every two weeks with a balanced fertiliser diluted at the package recommended rate.
Transplant the larkspur flowers outdoors in a well-drained, full sunbed in spring once frost danger has passed. Space the plants 12 to 16 inches apart.
Water the flowers once weekly so the top 6 inches of soil remains moist. Larkspur tolerates some drought but flowers best with consistent soil moisture.
Tips and warnings
- Larkspur readily seeds itself in the garden, often returning each year from seeds shed the previous year.
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