Sonja

SKU: FL4093
Sonja is a quintessential sunflower with its 10cm (4”) blooms of bright yellow/orange petals with a dark centre. Read More

Exposure Full Sun

Season Warm Season

Seed type OP ?

Average Seeds Per Gram 65 ?

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New for 2026
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West Coast Seeds ships anywhere in North America. However, we are not able to ship garlic, potatoes, asparagus crowns, bulbs, onion sets, Mason bee cocoons, or nematodes outside of Canada. We regret, we cannot accept returns or damages for orders outside of Canada. The minimum shipping charge to the US is $9.99.

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Sonja

Product Details

Sonja is a quintessential sunflower with its 10cm (4”) blooms of bright yellow/orange petals with dark centres. 96-106cm (38-42") tall branching plants produce 8 or more flowers on long, strong stems. A day-length neutral variety that produces pollen loved by bees.

Quick Facts:

    • Branching plants
    • Day-length neutral
    • Produces pollen loved by bees
    • Classic looking sunflower

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All About Sonja

Latin

Latin
Helianthus annuus
Family:Β Asteraceae

Difficulty

Difficulty
Easy

Season & Zone

Season & Zone
Exposure: Full sun

Timing

Timing
Direct sowΒ repeatedly after the last frost date. Starting indoors is possible, but does not gain much time. If sunflowers are allowed to get root-bound, they will lack stability at transplant time, and will require staking. Optimal soil temperature for germination:Β 21-30Β°C (70-85Β°F). Seeds should sprout in 10-14 days.

Starting

Starting
Sow seeds 5mm-1cmΒ  (ΒΌ-½”) deep. Space dwarf varieties 15cm (6β€³) apart, but give the giants lots of room at 1m (3β€²) between plants.

Growing

Growing
ToΒ grow really big plants with really big flowers, enrich the soil with organic matter and incorporate 2 cups ofΒ balancedΒ organic fertilizer per 3m (10β€²) of row, and irrigate regularly. When the plants are 30cm (12) tall, dissolve 5ml (1 tsp) of borax (for boron) in 350 ml (12 fl oz) of water and spread the solution over 5m (15β€²) of row. Be careful not to over-apply this solution. This application of boron will produce bigger seeds and flower heads. Do not apply boron to other garden plants. When the back of the flower head turns yellow, it is ready to be cut from the plant.

Companion Planting

Companion Planting
Sunflowers planted near rows of corn are said to increase yields. Sunflowers can be used to draw heavy metals, toxins, and even radiation from soil, but should be burned at the end of the season if grown for this purpose. Plant sunflowers amid squash plantings to improve pollination and overall production.

More on Companion Planting.

Customer Reviews & Questions