Growing Sunflowers at Home
Sunflowers are one of the easiest and most rewarding flowers to grow. Their bright blooms, impressive height, and ability to attract pollinators make them a favourite among gardeners of all experience levels. Whether you're planting a few flowers in your backyard or creating a larger sunflower patch, this guide will help you get started.
Why Grow Sunflowers?
Sunflowers are popular for several reasons:
- Easy to grow from seed
- Fast-growing and low maintenance
- Attractive to bees, butterflies, and birds
- Available in a variety of sizes and colours
- Excellent for cut flowers and seed production
Choosing the Right Sunflower Variety
Before planting, select a variety that suits your space and goals.
Tall varieties
These can grow 1.8–3.6 m or more and make a dramatic garden statement.
Dwarf Varieties
Perfect for containers, small gardens, and borders. Most grow between 30–90 cm tall.
Multi-Branching Varieties
Produce multiple blooms throughout the season, making them ideal for continuous colour and cut flowers.
When to Plant Sunflowers
Plant sunflower seeds after the danger of frost has passed and soil temperatures have warmed. Sunflowers thrive in warm conditions and require plenty of sunlight to grow successfully.
Selecting the Best Location
Sunflowers perform best when they receive:
- At least 6–8 hours of direct sunlight daily
- Well-drained soil
- Protection from strong winds, especially for taller varieties
- Choose a location with enough space for mature plants to grow without crowding.
How to Plant Sunflower Seeds
- Loosen the soil to a depth of 15–20 cm.
- Plant seeds about 2.5 cm deep.
- Space seeds according to the variety:
- Dwarf types: 15–30 cm apart
- Tall varieties: 45–60 cm apart
- Water thoroughly after planting.
Seeds usually germinate within 7–10 days under favourable conditions.
Watering Tips
Sunflowers need consistent moisture during germination and early growth.
Water regularly but avoid waterlogging the soil.
Once established, sunflowers become relatively drought-tolerant.
Deep watering encourages stronger root development.
Feeding and Fertilising
Sunflowers are not heavy feeders, but they benefit from nutrient-rich soil.
Add compost before planting.
Use a balanced fertiliser if soil fertility is low.
Avoid excessive nitrogen, which can promote leaf growth at the expense of flowers.
Supporting Tall Sunflowers
Large sunflower varieties may require staking in windy areas.
Install stakes early to avoid damaging roots.
Tie stems loosely with soft garden ties.
Common Growing Problems
Birds Eating Seeds
Cover newly planted areas with netting until seedlings emerge. Use a plant label to mark where you sowed the seed.
Slugs and Snails
Protect young plants with barriers or appropriate control methods.
Powdery Mildew
Improve air circulation and avoid overhead watering.
Bent or Broken Stems
Provide support and protect plants from strong winds.
When Do Sunflowers Bloom?
Most sunflower varieties bloom approximately 70–100 days after planting, depending on the variety and growing conditions. Flowers will gradually open and remain attractive for several weeks.
Harvesting Sunflower Seeds
If growing sunflowers for seed:
- Allow flower heads to mature on the plant.
- Wait until the back of the flower head turns yellow-brown.
- Cut the flower head and allow it to dry in a protected area.
- Rub seeds free and store them in a cool, dry place.
Plant, Grow, Enjoy
Sunflowers are an excellent choice for beginner gardeners because they are easy to grow, visually stunning, and highly beneficial to pollinators. With plenty of sunlight, well-drained soil, and regular watering during early growth, you can enjoy beautiful blooms and a successful harvest throughout the growing season.
NB: For Large scale sunflower plantings please contact marketing@egmontseeds.co.nz for more detailed growing instructions and varieties use.
