Try searching online for ‘Lutein’ and you’ll soon realise that there is huge demand for lutein supplements as an aid to eye health. How much better to grow this eye catchingly, colourful nasturtium and supplement your lutein levels naturally whilst bringing a welcome zing of colour and flavour to your salad bowl. Research has shown yellow nasturtiums as having the highest levels of lutein of any species tested so far, with 10x more than other great sources like sweet corn and broccoli.