Why is my teddy bear magnolia leaves losing their deep green colour? How can I fix this?

Thank you for contacting Yates.

This could due to lack of nutrients, you may try to add some complete fertiliser to encourage the deep green colour. Try 'Yates Dynamic Lifter Soil Improver and Plant Fertiliser' as a complete, soil-conditioning  fertiliser. It's certified for use in organic gardens and will help create a nutrient rich soil for better root growth, stronger plants and more flowers and fruit! It can be used on gardens all year round, including native plants. Click here for more info on this product: https://www.yates.com.au/product/garden-fertilisers/certified-organics/yates-dynamic-lifter-soil-improver-plant-fertiliser