Let it Grow says farewell after two wonderful years. Read how we built our innovation platform here Created with Sketch.

How to grow the world’s tallest Sunflower

Plant ABC

Words by Kelsey Lee Jones

Illustrations by Camilla Perkins

The world’s tallest Sunflower was grown by the German gardener Hans-Peter Schiffer and measured a whopping 9.17metres. Do you think you could measure up? Here are our best tips for growing a tall and beautiful friend of your own.  

Latin name: Helianthus annuus

Nickname: Likes to go by its nickname ‘Sunflower’

Family: Asteraceae

Native to: America

Spotted in: Yayoi Kusama’s Flower Obsession Sunflower performance (2000)

Life cycle: Some varieties are perennial others are annual

Soil: Well-drained, slightly acidic soil

Special feature: Their heliotropic nature, long stems and huge flower heads made up of smaller florets 

Plant your seeds in late spring

If you want your sunflowers to bloom next summer, it’s best to plant your seeds in late spring. The seeds are best planted straight into the soil outside but can be cultivated indoors until they begin to sprout. The flowers will be in full bloom in late summer and last for about two weeks. If you want to experience a continuous sunny bloom then plant a new row of seeds each week.

Sunflowers follow the sun

In the earliest cultures, Mayan, Inca and Aztec, the sunflower represented a symbol of the sun, its genus name even refers to the Greek sun god, Helios. One of the coolest things about sunflowers is that their flower heads turn with the movement of the sun, a plant motion known as heliotropism. When sunflowers are still young you’ll be able to watch them trace the sun across the sky, once fully matured they’ll stay facing east. Make sure you offer all the sun possible, sunflowers sit happiest in a sun-drenched spot in the garden or a window sill with a lot of light.

They waste no time

Due to their rapid growth in a short period of time, Sunflowers need a lot of nutrients. The soil will be the main source but make sure to give each flower plenty of water. You should keep in mind that the soil should be able to drain easily to avoid drowning the roots. When your flowers reach a good height, protect them from wind damage by tying them to a sturdy support.

A spiralling array of (edible) seeds

The ‘faces’ of each sunflower are actually made up of hundreds of smaller flowers that later mature into seeds, their formations make up beautifully complex spirals which follow the measurements of the Fibonacci Sequence. Seeds are surrounded by their distinct bright yellow flickering petals and a fully blooming head can span up to 60cm. When the seeds change colour from green to yellow, they’re ready to cut and harvest. Store in a dry, cool location until the disk turns dark brown – now you can munch on them, raw or roasted.

Did you know that sunflowers also have the power to inspire Hope? Find out how at our Let it Grow Concept Store at Amsterdam CS.