For unheated structures see our page on plants for cool conservatories and greenhouses.
Key
AGM = Denotes plants which have received the Society's Award of Garden Merit
(f) = Fragrant flowers or foliage
Climbers
Aeschynanthus pulcher AGM: bright red flowers from summer to winter. Height: 75cm (30in)
Allamanda cathartica: yellow flowers from summer to autumn. Height to 16m (53ft)
Asparagus plumosus: grown for its foliage. Height to 3m (10ft)
A. falcatus: (f) tiny white flowers in spring. Height to 7m (23ft)
Bougainvillea × buttiana: bracts in yellow, purple or red from summer to autumn. Height: to 12m (39½ft)
Clerodendrum thomsoniae AGM: white and crimson flowers in summer. Height: 4m (13ft)
Epipremnum aureum (syn. Scindapsus aureus) AGM: grown as a foliage plant. Height to 12m (39½ft)
Ficus pumila AGM: grown as a foliage plant. Height to 5m (16ft)
Mandevilla splendens AGM: yellow and white-throated, deep-pink flowers in summer. Height to 5m (16ft)
Monstera deliciosa AGM: grown for its foliage. Height: to 20m (66ft) in habitat, though much smaller in containers
Passiflora edulis: purple and white flowers from spring to autumn. Height to 5m (16ft)
P. quadrangularis AGM: (f) red, purple and white flowers from midsummer to autumn. Height to 15m (49ft)
Philodendron scandens (syn. P. hederaceum) AGM: grown as a foliage plant. Height to 6m (19¼ft)
Rhodochiton atrosanguineum (syn. volubilis) AGM: black to reddish-purple flowers from summer to autumn. Height: to 3m (10ft)
Stephanotis floribunda AGM: (f) white flowers from spring to autumn. Height: to 6m (19¼ft)
Shrubs and shrubby perennials
Aphelandra squarrosa ‘Louisae’ AGM: yellow and maroon-tinged flowers appearing sporadically from spring to autumn. Height and spread: to 2m (6½ft) by 1.5m (5ft)
Asparagus densiflorus ‘Sprengeri’ AGM: grown for its foliage. Height and spread: to 90cm (3ft) by 1.2m (4ft)
Begonia ‘Lucerna’: rose-pink flowers in summer. Height and spread: to 2.1m (7ft) by 35cm (14in)
B. sutherlandii AGM: orange flowers in summer. Height and spread: 12.5cm (5in) by 45cm (18in)
Billbergia × windii AGM: red-margined, purple-tipped, green flowers from pink bracts in summer. Height and spread: 50cm (20in) by 25cm (10in) or more
Bouvardia × domestica: white, pink or red flowers in summer and autumn. Height and spread: both to 60cm (2ft)
Brugmansia arborea ‘Knightii’ AGM: (f) double-white flowers in summer and autumn. Height and spread: 5m (16ft) by 2.4m (8ft)
B. × candida ‘Grand Marnier’ AGM: (f) single cream flowers aging to orange, in summer and autumn. Height and spread: 5m (16ft) by 2.4m (8ft).
B. sanguinea AGM: yellow, red-tipped flowers from spring to autumn. Height and spread to 10m (33ft) by 3m (10ft)
Brunsfelsia pauciflora AGM: (f) purple flowers aging to white, from spring to summer. Height and spread: to 3m (10ft) by 1.5m (5ft)
B. ‘Macrantha’: large purple flowers from spring to summer. Height and spread: to 3m (10ft) by 1.5m (5ft)
Cestrum aurantiacum: orange flowers from spring to early summer. Height and spread to 3m (10ft) by 2m (6½ft)
C. elegans AGM: crimson, purple-red or pink flowers, from summer to autumn. Height and spread: both to 3m (10ft)
C. ‘Newellii’ AGM: crimson flowers from summer to autumn. Height and spread: both to 3m (10ft)
C. parqui AGM: (f) lime-yellow flowers from summer to autumn. Height and spread: both to 2m (6½ft)
Citrus × microcarpa AGM (calamondin): (f) white flowers from spring to summer. Height and spread: to 6m (19¼ft) by 3m (10ft)
Crossandra infundibuliformis AGM: orange-yellow, to salmon-pink flowers, all year round. Height and spread: 90cm (3ft) by 60cm (2ft)
Erythrina crista-galli AGM: deep-red flowers from summer to autumn. Height and spread: to 19m (29¼ft)
Ficus benjamina AGM: grown for its foliage. Height and spread: to 30m (99ft) by 15m (49ft) in habitat, though much smaller in containers
F. elastica: grown for its foliage. Height and spread: both to 60m (198ft) in habitat, though much smaller in containers
F. lyrata AGM: grown for its foliage. Height and spread: to 30m (99ft) by 20m (66ft) in habitat, though much smaller in containers
F. microcarpa: grown for its foliage. Height and spread: to 25m (82ft) by 30m (99ft) in habitat, though much smaller in containers
Gardenia jasminoides AGM: (f) white flowers from summer to autumn. Height and spread: to 12m (39½ft)
Hibiscus rosa-sinensis: bright crimson flowers form summer to autumn. Height and spread: to 5m (16ft) by 3m (10ft)
Justicia brandegeeana (syn. Beloperone guttata) AGM: pink bracts with white flowers all year round. Height and spread: both to 90cm (3ft)
Mimosa pudica AGM: grown for its foliage. Height and spread: to 75cm (30in) by 90cm (3ft)
Pachystachys lutea AGM: yellow bracts with white flowers in summer. Height and spread: to 90cm (3ft) by 75cm (30in)
Pilea cadierei AGM: grown for its foliage. Height and spread: to 30cm (12in) by 20cm (8in)
Salvia rutilans: scarlet flowers from winter to spring. Height and spread: to 1.8m (6ft) by 90cm (3ft)
Senna corymbosa (syn. Cassia corymbosa): yellow flowers in late summer. Height and spread: to 4m (13ft) by 3m (10ft)
Bulbous, rhizomatous and herbaceous plants
Aechmea fasciata AGM: blue and pink flowers from pink bracts in summer. Height and spread: 40cm (16in) by 50cm (20in)
Amaryllis belladonna AGM: (f) pink flowers in autumn. Height and spread: 60cm (2ft) 10cm (4in)
Asclepias curassavica: red or orange-red flowers from summer to autumn. Height and spread: 90cm (3ft) by 60cm (2ft)
Asplenium nidus AGM: grown for its foliage. Height and spread: to 15m (5ft) by 90cm (3ft)
Begonia foliosa var. miniata AGM: Height and spread: 45cm (18in) by 30cm (1ft)
B. haageana (syn. B. scharffii): pinkish-white flowers from winter to spring. Height and spread: 1.2m (4ft) by 60cm (2ft)
B. metallica AGM: red flowers in autumn. Height and spread: 90cm (3ft) by 60cm (2ft)
Calathea cooperi: grown for its foliage. Height and spread: to 5m (16ft) by 4m (13ft)
Cyrtanthus elatus (syn. C. purpureus, Vallota speciosa) AGM: scarlet flowers in late summer. Height and spread: to 60cm (2ft) by 10cm (4in)
Ensete ventricosum (syn. Musa ensete): grown for its foliage. Height and spread: 6m (19½ft) or more by 5m (16ft)
Fittonia albivenis Verschaffeltii Group AGM: grown for its foliage. Height and spread: 10cm (4in) by indefinite
Haemanthus albiflos AGM: white flowers from autumn to winter. Height and spread: to 30cm (12in) by 15cm (6in)
H. coccineus AGM: red flowers in summer and autumn. Height and spread: to 35cm (14in) by 15cm (6in)
Hymenocallis × festalis: (f) white flowers in summer. Height and spread: 80cm (32in) by 30cm (1ft)
H. ‘Sulphur Queen’: (f) sulphur-yellow flowers in summer. Height and spread: 60cm (2ft) by 30cm (1ft)
Kohleria eriantha (syn. K. hirsuta) AGM: yellow-spotted, orange-red flowers in summer. Height and spread: 1.2m (4ft) by 30cm (1ft)
Musa acuminata ‘Dwarf Cavendish’ AGM: grown for its foliage. Height and spread: to 6m (19½ft) by 3m (10ft)
Platycerium bifurcatum AGM: grown for its foliage. Height and spread: to 90cm (3ft) by 80cm (32in)
Polianthes tuberosa: (f) white flowers in summer. Height and spread: 1.2m (4ft) by 15cm (6in)
Ruellia makoyana AGM: carmine-pink flowers in summer. Height and spread: 60cm (2ft) by 45cm (18in)
Spathiphyllum wallisii: (f) white flowers in spring and summer. Height and spread: 65cm (26in) by 50cm (20in)
Sprekelia formosissima: deep-crimson flowers in spring. Height and spread: to 35cm (14in) by 15cm (6in)