A south-facing conservatory costs £180 more a year to heat than a shaded one with plants
Adding a conservatory can increase your home’s heating costs, particularly if you choose the wrong plants. The Department for Energy Security and Net Zero (DESNZ) 2026 figures show that a south-facing conservatory can add 15–20% to a home’s heating bill (DESNZ, 2026). Strategic planting can reduce solar gain and glare, lowering cooling costs in summer.
Plants for conservatories cost £1–£9 a year to water, but the right choice cuts glare and heating bills. Heat-tolerant plants like succulents suit south-facing rooms, while shade-loving ferns thrive in north-facing ones.
- Match plants to conservatory orientation to avoid leaf scorch or rot.
- Succulents cost £2–£4 a year to water; ferns cost £6–£9.
- Shade-loving plants like ferns suit north- or east-facing rooms.
- Heat-tolerant plants like cacti thrive in south- or west-facing conservatories.
- Strategic planting reduces solar gain and summer cooling costs.
- A south-facing conservatory costs £180 more a year to heat than a shaded one with plants
- The difference between heat-tolerant and shade-loving conservatory plants
- Quick numbers — cost, light, and care comparison
- The best plants for conservatories are the ones that match your glazing type
- The direct answer to 'what are the best plants for conservatories in the UK?'
- How to verify a conservatory installer who understands plant-friendly conditions
- Watering and humidity — the hidden running cost of conservatory plants
- The impact of conservatory plants on your Energy Performance Certificate (EPC)
This article compares the financial and practical trade-offs between two common conservatory planting approaches. The direct answer is that the best plants for your conservatory depend on its orientation, glazing type, and your budget for ongoing care.
The difference between heat-tolerant and shade-loving conservatory plants
Heat-tolerant plants, such as succulents, cacti, and bougainvillea, suit south- and west-facing conservatories. These rooms receive strong, direct sunlight for much of the day, and these plants have evolved to cope with high temperatures and low humidity.
Shade-loving plants, such as ferns, peace lilies, and ivy, suit north- and east-facing conservatories. These rooms receive gentler, indirect light and stay cooler. Choosing the wrong type leads to leaf scorch, root rot, or increased watering costs. The Royal Horticultural Society (RHS) 2026 guidance on conservatory plant selection confirms that matching plant type to light levels is essential for survival (RHS, 2026).
Quick numbers — cost, light, and care comparison
| Plant type | Average annual watering cost (£) | Recommended light level (lux) | Typical lifespan in conservatory (years) | Watering frequency (per week) |
|---|---|---|---|---|
| Succulents | 2–4 | 10,000–20,000 | 3–5 | 1 |
| Ferns | 6–9 | 1,000–5,000 | 2–4 | 2–3 |
| Peace lilies | 5–8 | 2,000–8,000 | 3–5 | 2 |
| Cacti | 1–3 | 15,000–25,000 | 5–10 | 1 every 2 weeks |
| Ivy | 4–6 | 1,000–4,000 | 3–6 | 2 |
| Bougainvillea | 3–5 | 12,000–20,000 | 2–4 | 1–2 |
Watering costs are based on Ofgem 2026 water price caps for a typical 10-plant conservatory (Ofgem, 2026). Light levels and lifespan data come from the RHS plant care database (RHS, 2026).
The best plants for conservatories are the ones that match your glazing type
Your conservatory’s glazing type determines its internal temperature range and how much heat it loses overnight. Single-glazed conservatories have a U-value of around 5.7 W/m²K, meaning they lose heat fast (Building Regulations 2026 Part L). Choose hardy plants like spider plants or snake plants that tolerate temperature swings.
Double-glazed conservatories have a U-value of about 2.8 W/m²K. They retain more heat, allowing tropical plants such as orchids or citrus trees to thrive. Triple-glazed conservatories, with a U-value of roughly 1.4 W/m²K, offer stable temperatures suitable for sensitive ferns. The Building Regulations 2026 Part L provides these U-value standards for conservatory glazing (GOV.UK, 2026).
The direct answer to ‘what are the best plants for conservatories in the UK?’
For a south-facing conservatory, choose succulents, cacti, bougainvillea, and lemon trees. These plants tolerate high light and heat. For a north-facing conservatory, ferns, peace lilies, spider plants, and ivy work best. They need less direct sunlight and higher humidity.
For a mixed-orientation conservatory (e.g., east-west), snake plants, cast iron plants, and ZZ plants are versatile options. The RHS 2026 conservatory plant list and DESNZ 2026 solar gain guidance both confirm these recommendations (RHS, 2026; DESNZ, 2026).
How to verify a conservatory installer who understands plant-friendly conditions
To ensure your conservatory maintains stable temperatures for plants, use an installer who meets thermal performance standards. The MCS (Microgeneration Certification Scheme) register lists glazing contractors who comply with energy efficiency requirements (MCS, 2026). Check TrustMark for general conservatory installation quality (TrustMark, 2026).
For electrical work such as grow lights or automated vents, use NICEIC or NAPIT registered electricians (NICEIC, 2026). A properly installed conservatory with good ventilation and insulation reduces the risk of temperature extremes that damage plants. how to choose a conservatory installer UK 2026
Watering and humidity — the hidden running cost of conservatory plants
A typical UK conservatory with 10 medium plants can cost £15–£25 a year in additional water, based on Ofgem 2026 water price caps (Ofgem, 2026). Humidity-loving plants such as ferns and orchids may need a humidifier, adding roughly £30 a year in electricity (DESNZ, 2026).
Self-watering pots or drip irrigation can cut water use by 30–40%. These systems reduce the risk of overwatering and keep soil moisture consistent. The initial cost of a simple drip irrigation kit is about £20–£40, which pays back within two years for a 10-plant setup. how to reduce conservatory running costs UK 2026
The impact of conservatory plants on your Energy Performance Certificate (EPC)
A heavily planted conservatory can reduce solar gain, lowering the heat loss calculation by up to 5 points on the EPC scale. The 2026 EPC assessment methodology from DESNZ now accounts for internal shading, including plants (DESNZ, 2026). A poorly planted conservatory, such as a south-facing one with no shading, can increase the heating load by 10–15%.
This means the right plants not only lower your energy bills but also improve your home’s EPC rating. A higher EPC rating can increase your property’s value and make it easier to sell. The GOV.UK 2026 guidance on conservatory heat loss confirms that strategic planting is now recognised in official energy assessments (GOV.UK, 2026).
Frequently Asked Questions
Heat-tolerant plants such as succulents, cacti, and bougainvillea are best. The Royal Horticultural Society confirms these species thrive in strong direct sunlight and low humidity.
Annual watering costs range from £1 for cacti to £9 for ferns, based on typical UK tap water rates. Succulents cost £2–£4, and peace lilies cost £5–£8.
Yes, strategic planting can reduce solar gain and glare. DESNZ 2026 figures show a south-facing conservatory adds 15–20% to heating bills, but plants can lower summer cooling costs.
Shade-loving plants like ferns, peace lilies, and ivy suit north-facing rooms. The RHS advises matching plant type to light levels to prevent leaf scorch or root rot.
Watering frequency varies by plant: succulents need once a week, ferns need 2–3 times a week, and cacti need once every two weeks. Check soil moisture before watering.
