The UK’s biggest garden centre retailer has unveiled plans for further growth, amid what it described as a fragmented market.

Blue Diamond Limited, the country’s leading garden trader in terms of sales, has announced that it plans to raise a £60 million investment from Caledonia Investments plc, a FTSE 250 investment trust.

Of this, £40 million will be used as a “war chest” for store acquisitions and investment.

£20 million is being ring fenced to fund share buy-backs

Caledonia will become a 16% minority shareholder in Blue Diamond, and the partnership brings prospect of further investment

Blue Diamond said the investment would “accelerate its growth” following strong results last year.  It plans to seek new sites to add to its current 54 centres, having added an average of 4 centres per annum in the past five years. 

The strategy has produced sales growth of nearly 90% over the same period. In 2025 alone, sales increased by 19% to £395 million and profit before tax grew by 44% to £31 million. The business employs some 5,000 people.

CEO Alan Roper said: “We are delighted to welcome Caledonia as an experienced long-term partner, at an exciting point in Blue Diamond's development. 

“We are ambitious to seize the significant opportunity we see in the garden centre sector. Caledonia’s support will enable us to pursue the next phase of our growth without compromising the financial and operational discipline that has always been so crucial to our success. 

“We also welcome the chance to provide our current shareholders with a liquidity opportunity that rewards their patience and support to date."

Tom Leader, Head of Caledonia Private Capital, added: “Blue Diamond is exactly the type of business with which we look to partner: a clear market leader with an outstanding management team delivering excellent cash generation which can be re-invested to grow the Business. We are delighted to be partnering with Blue Diamond and look forward to supporting the company through its next phase of growth.”

The UK garden centre market is worth some £5 billion and is still highly fragmented, with a majority of garden centres family-owned or in small groups. 

Blue Diamond said it had consistently demonstrated an ability to acquire good sites, preserve their local character and retain customer loyalty, but also to improve business performance.

A spokesperson added: “Caledonia’s backing as an equity investor will enable the company to realise its ongoing ambitions while maintaining a conservative balance sheet. 

“Beyond the investment announced today, Caledonia has also agreed, subject to customary conditions, to make available up to £40 million of additional capital to support Blue Diamond's development over the next five years, and to provide current shareholders with further share buy-backs.”

Caledonia has more than £3 billion of assets and extensive experience investing in both public and private companies. Within its Private Capital portfolio, Caledonia typically invests between £50 million and £150 million in businesses with strong market positions, attractive growth prospects and high-quality management teams. A defining characteristic of Caledonia's approach is its willingness to actively support businesses over many years, providing not only capital but also strategic guidance.

The investment is subject to Blue Diamond shareholder approval at its AGM on 2 July 2026.