The Sir Harold Hillier Gardens And Arboretum
Also known as: The Hillier Arboretum, The Sir Harold Hillier Gardens, Sir Harold Hillier Gardens
1. To preserve and develop one of the largest collections of hardy trees,shrubs and herbaceous perennials in the western temperate world.2.To maximise the plant collection's formal and informal education potential3. To be a significant contributor to conservation4. To meet the needs of an increasing number of visitors
Activities & Mission
1. To preserve and develop one of the largest collections of hardy trees,shrubs and herbaceous perennials in the western temperate world.2.To maximise the plant collection's formal and informal education potential3. To be a significant contributor to conservation4. To meet the needs of an increasing number of visitors
Areas of Operation
Where this charity is registered to operate, as self-declared to the Charity Commission. These are regulatory classifications, not a list of active programmes, and don't necessarily indicate fundraising activity in each location.
Local Authority
Financial Information
Financial Efficiency
Higher than 92% of UK Facilities charities with income £1M to £10M (sample: 283). How is this calculated?
Higher than 100% of UK Facilities charities with income £1M to £10M. How is this calculated?
Lower overhead than 66% of UK Facilities charities with income £1M to £10M. (Lower overhead is generally read as more efficient.) How is this calculated?
Latest Financial Breakdown
Income Sources
Expenditure Categories
Financial Trend
Annual Returns
As filed with the Charity Commission for England and Wales. Most recent filing covers the financial year ending 2025.
| Financial Year | Income | Expenditure | Charitable Spending | Net Assets | Reserves | Staff |
|---|---|---|---|---|---|---|
| 2025 | £3,614,562 | £4,186,518 | £4,186,518 | £12,423,992 | £245,311 | 76 / 178 |
| 2024 | £2,402,222 | £2,645,786 | £2,645,786 | £12,961,948 | £761,738 | 56 / 180 |
| 2023 | £2,007,547 | £2,347,341 | £2,347,341 | £13,082,512 | £760,261 | 47 / 180 |
| 2022 | £1,901,766 | £2,048,468 | £2,048,468 | £13,238,737 | £823,230 | 50 / 200 |
| 2021 | £2,726,792 | £2,186,137 | £2,186,137 | £13,349,782 | £1,142,231 | 48 / 200 |
Staff column shows: Employees / Volunteers
Frequently asked questions about The Sir Harold Hillier Gardens And Arboretum
What does The Sir Harold Hillier Gardens And Arboretum do?
1. To preserve and develop one of the largest collections of hardy trees,shrubs and herbaceous perennials in the western temperate world.2.To maximise the plant collection's formal and informal education potential3. To be a significant contributor to conservation4. To meet the needs of an increasing number of visitors
How much income did The Sir Harold Hillier Gardens And Arboretum report in 2025?
The Sir Harold Hillier Gardens And Arboretum reported total income of £3.61m and reported expenditure of £4.19m for the financial year ending 2025, based on the most recent annual return filed with the Charity Commission.
How efficient is The Sir Harold Hillier Gardens And Arboretum?
The Sir Harold Hillier Gardens And Arboretum has a program ratio of 115.8%, meaning that share of its income goes directly to charitable activities. This is higher than 92% of UK Facilities charities with income £1M to £10M (sample of 283 charities). See our methodology for how this is calculated.
When was The Sir Harold Hillier Gardens And Arboretum registered as a charity?
The Sir Harold Hillier Gardens And Arboretum was registered with the Charity Commission for England and Wales on 12 January 1978 as charity number 274737. It has been registered for 48 years.
Who runs The Sir Harold Hillier Gardens And Arboretum?
The Sir Harold Hillier Gardens And Arboretum is governed by a board of 1 trustee. Trustees are legally responsible for the charity's governance and are listed in full on its profile.
Where does The Sir Harold Hillier Gardens And Arboretum operate?
The Sir Harold Hillier Gardens And Arboretum operates in Hampshire, as recorded in its Charity Commission filing.
Is The Sir Harold Hillier Gardens And Arboretum a registered charity?
Yes — The Sir Harold Hillier Gardens And Arboretum is a registered charity in England and Wales, charity number 274737.
Details
The Castle
Castle Avenue
WINCHESTER
Hampshire
SO23 8UJ
Registry Information
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Trustees
Sectors & Classifications
Also Known As
- The Hillier Arboretum
- The Sir Harold Hillier Gardens
- Sir Harold Hillier Gardens
Data & trust
- Register data refreshed
- 14 May 2026
- Methodology
- How metrics are calculated