Gardeners providing nesting habitats in gardens has risen by 11% to 24%. The number building ponds is up 5% to 17%. The HTA said gardeners felt they could control wildlife but not climate change.
The report said gardeners may be feeling "environmental fatigue caused by relentless warnings about climate change", while the recession means people are more worried about pensions, their savings and property prices than the environment.
HTA marketing director Andrew Maxted said the report identified opportunities for water and waste and wildlife product companies.
- Meanwhile, another HTA report, entitled Gardeners Online, has discovered that the proportion of people buying gardening products online has not changed greatly since 2007, but gardening companies can increase footfall by setting up a website and using social-networking sites.
The HTA said eight per cent of all garden product sales (including plants) are made either online or through mail order - categories it does not split in its research.
Plants account for 75% of mail-order/online garden-related sales. Mail order and online account for 12% of total retail plant sales and four per cent of non-plant sales. The research was undertaken by Ipsos MORI.