The 2018 Sunflower Competition registrations have now closed. Expression of interests form for 2019 is now open.

Important Dates

  • Registrations close: 9 February 2018
  • Planting date: 20 February 2018
  • Submission date for Communicating Science entries: Tuesday 8 May 2018 (if you would like it displayed at the Weigh-in Day). Alternatively, the final date for submission is Tuesday 22 May 2018.
  • Weigh-in Day at UQ Gatton campus: 15 May 2018

Download the 2018 UQ Sunflower Competition itinerary and key details before the event.

How to submit your 'Heaviest Yield: Regional' video

  1. Place a thirty centimetre ruler in front of your pot
  2. Start filming with a shot of the pot and move up the stem to the flower
  3. Film the removal of the head as per the instructional video on this page
  4. Place the head of the flower on a set of digital scales with the screen clearly visible
  5. While recording, please clearly state the following, "This is the entry for <Group Name> from <School Name> in the year <7-10/11-12> category."
  6. Save the file with the school, group and category included (e.g.

Submit your 'Heaviest Yield: Regional' video via the Cloudstor website 

Please note:

  • The recording should be no more than 45 seconds (a smartphone will provide sufficient quality)
  • Acceptable file types include: MPG, MPEG, AVI, WMV, WAV, MOV
  • The file needs to be less than 15MB


About Sunflower competition

The University of Queensland’s Sunflower Competition is designed to inspire current science students to become the next generation of plant and agricultural scientists and support teachers to deliver their science curriculum in a plant-based context. The competition provides an interactive learning opportunity with school-based experiments and an optional day of workshops and awards at the UQ Gatton campus.

Rules of the Competition

Teachers and students can participate in a number of ways. 

You can

  1. Grow sunflowers at your school as part of the curriculum (with optional attendance at Weigh-in Day)
  2. Bring the sunflowers you have grown to the UQ Gatton campus to compete for prizes at the official Weigh-in Day.
  3. If you cannot attend the Weigh-in Day, enter the ‘Heaviest Yield: Regional’ category of the UQ Sunflower Competition by submitting a video showing the sunflower head being removed and weighed on a set of calibrated digital scales. Video must be in MP4 format, maximum 30 seconds and submitted by 12 noon on the day prior to Weigh-in Day.
  4. Enter the ‘Communicating Science’ or ‘Scientific Investigations’ categories in the Queensland Science Contest by submitting your entry to the UQ Sunflower completion before May 22. Submit before May 8 if you would like your entry displayed at the Weigh-in Day.

Download the rules (pdf 450KB).


You will be provided with a booklet containing several experiments you can complete in your school. These include a few simple ‘beginner’ experiments aimed at grades 7-8 and some suggestions on how to make the existing experiments more ‘advanced’, targeting grade 11-12 students. Each experiment includes contextual information about how the experiment relates to the real world and the concepts covered. 

In addition to growing sunflowers for the competition, you may want to design your own sunflower-based experiment. Sunflowers are a good choice for experiments as they are easy to germinate, grow and maintain.  

Previous weigh-in day photos



Frequently asked questions

What are the important points the judges will look at?

The plant has been grown in a 14 litre pot or smaller, grown in a solid medium (not grown in a hydroponic situation) and in the container presented. The roots have not grown through the base of the pot and were not cut off in order to bring the plant to the competition. The pot is of the correct size. We strongly suggest competitors use only a recommended pot if you are bringing your plants to the competition day.

What part of the plant is included in the weigh-in?

All parts of the plant above the cotyledonary node are included. This includes the flower head, all leaves and stem.

What is the cotyledonary node?

This is the first node produced by the seedling when it germinates. It is the node where the cotyledons are. Cotyledons are the first two leaves to emerge after the sunflower seed germinates. The nodes is an area on the stem where the leaves are attached.

Do sunflowers really face the sun?

In a certain stage of growth known as the “budding” stage, sunflowers do face the sun, however, they will not do so permanently.

What is the best time for growing sunflowers?

Sunflowers can be planted all year round though they thrive best during warm summer conditions.

How many flowers or heads does the sunflower plant have?

The cultivated sunflower should only have one flower or head though other cultivated and wild varieties are known to have multiple flowers.

Why are sunflowers grown as a commercial crop in Australia?

The sunflower is a major summer oilseed crop and consumers are becoming more aware of the benefits of the various types of sunflower oil. Sunflower oil is light in taste and appearance. It is also popular because it is low in saturated fats and high in vitamin E. Sunflower seeds are very nutritious, boasting high levels of zinc, potassium and phosphorus.

Why is my sunflower not growing well?

Many variables contribute to strong sunflower growth. Just remember, sunflower plants will mature anywhere between 60-80 days. In the meantime, have you checked:

  • Where your pot is positioned
  • The pH level of your soil
  • Your soil type
  • Any drainage issues (plants should not be waterlogged)
  • How much you are watering? Too much or too little?
  • Fertiliser type and amount being administered.

My sunflower plant is getting quite tall, how can I support the plant?

You may wish to use a piece of bamboo to stake your plants.

Do any pests like sunflowers?

Yes, keep watch for birds, slugs and snails. Be proactive with plants and diseases. Try to check on your plants every day. If you see something developing, you can treat it right away. And remember: treating for pests does not ruin an experiment.


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