Danny founded his own garden design company in 1997,[3] and called himself The Black Gardener after noting that another businessman calling himself the Black Farmer was having success. The name led to him being noticed and invited to screen test for The Instant Gardener,[4] a daytime BBC programme that ran for two seasons in 2015 and 2016.[5][6] He also appeared as a presenter for the BBC on the RHS Chelsea and RHS Tatton Flower shows, Tree of the Year for Channel 4 in 2016.[7] In 2019 he joined the ITV This Morning team creating colourful and creative garden transformations.
Danny has also been seen as a presenter on The BBC Welsh Show, an edition of BBC’s Inside Out concerning land for allotments and ITV’s Tonight programme giving sustainability advice.
Danny has appeared as a contestant on BBC game shows such as Celebrity Mastermind (2016), Celebrity Eggheads (2017), Pointless Celebrities (2023), Celebrity The Weakest Link (2024) and up-cycling programme Celebrity Money for Nothing (2017).
Danny was commissioned in 2021 by Gloucester Royal Hospital to design and construct a Covid Memorial Garden in honour of the doctors, nurses and staff who showed bravery on the pandemics frontline. The garden was opened by HRH Princess Anne later that year.
In 2023, a prestigious David Austin English shrub rose called 'Dannahue' was named after him, for his contribution to community gardening. A percentage of the proceeds from the sale were donated to Grow To Know a not-for-profit he co-directs with gardening activist Tayshan Hayden-Smith. The charitable organisation supports horticulture within diverse communities.[8]
Danny and the “Dannahue” rose featured prominently in a New York Times article in 2023.
In 2022 Grow To Know were awarded a silver guilt medal at RHS Chelsea Flower Show for their “Hands off Mangrove” by Grow To Know show garden.
Danny in memory of his sister Margot who died from a brain tumour in 2012 is a proud patron of the Brain Tumour Research charity. He also holds ambassadorial positions for the Woodland Trust, Queens Green Canopy, Blue Cross and the National Garden Scheme (NGS).