18 June 2021 11:48 AM
Thank you for contacting Yates.
Generally speaking, lack of nutrients is the main cause of yellow leaves on Gardenia. Gardenia thrives in acidic soil, high soil pH could affect the nutrients intake and cause trace element deficiency. So it's a good idea to start testing the soil pH:
- If the soil pH is around 5-6, try weekly application with 'Yates Thrive Roses & Flowers Natural Fish & Seaweed+ Concentrate' as a complete fertiliser to assist with healthy growth and prolific, beautiful flowers. Click here for more info on this product: https://www.yates.com.au/product/garden-fertilisers/organic-based/yates-thrive-natural-roses-flowers-concentrate
- If the soil pH is over 6, try reduce the soil pH by applying 'Yates Soil Acidifier Liquid Sulfur'. It helps creates ideal growing conditions for acid loving plants. It's an easy-to-use liquid formulation, it can be diluted and applied without the dust and the mess associated with traditional granular products. Click here for more information on this product: https://www.yates.com.au/product/garden-fertilisers/speciality-fertilisers/yates-soil-acidifier-liquid-sulfur
Meanwhile, spray the leaves with 'Yates Health Tonic Trace Element Chelates' as an easy to use liquid trace element mix. Recommended as a foliar application, this delivers nutrients directly to the deficient leaves for faster results.
Hope this helps and happy gardening :)