'Frostproof' is a hardy gardenia with double rose-like flowers with intoxicating gardenia fragrance and good bloom even in cool springs and summers.

'Kleim's Hardy' has incredible gardenia fragrance and is hardy to minus 18 degrees Celsius! Go figure.

‘Summer Snow’ has beautiful pure white double flowers that are sweetly fragrant. Reportedly hardy to zone 6 which would make it the hardiest of the hardyGardenia.

Gasteria 'Little Warty' has light grey-green leaves with raised pale silvery-green stripes with bumpy tubercles.

Gasteria 'Silver Bullion' is an intriguing variegated succulent in shades of forest green, grey-green, light green and ivory white.

Gaultheria procumbens Winter Fiesta has large, white berries that flush to pink on red stems.

Gaultheria procumbens 'Winter Splash' is the only variegated Wintergreen on the market.

Gethyllis barkerae has flattened, hairy, grey-green leaves that lie close to the ground and palest pink to white, fragrant flowers.

Gethyllis oligophylla has cool grey-green spiralled leaves and white, fragrant flowers.

Gethyllis oliverorum has cool grey-green spiralled leaves and white, fragrant flowers.

G. papilio is a hardy gladiolus with slate-lilac flowers.

Gladiolus papilio 'Ruby' is a hardy glad with stunning, bright magenta red flowers.

Gladiolus 'Circus Club' has white backgrounds splashed with purple around lemony-yellow centres and maroon eyes.

Gladiolus 'Goldrush' has delicately ruffled yellow blooms edged with an orange-coppery glow.

Gladiolus 'Passos' displays lavender flowers sprayed with dark purple around dark purple and red throats.

Gladiolus 'Rostov' displays blends of red, blue and pink on ruffled flowers.

Globba schomburgkii has large, dark green, tropical leaves and large, golden yellow clusters of branched, ginger-like flowers.

'Mount Everest' is a magnificent white selection Globba winitii with incredible, tropical flowers.

Gloriosa carsonii has striking flowers with yellow rippled petals centred with burgundy-red.

Gloriosa greenii offers greenish yellow to lemon yellow flowers with thick, leathery, lightly rippled petals.

Gloriosa lutea has pale lemon-yellow flowers that are crisped on the edges and turn orange-yellow as they age.

Gloriosa superba 'Himalayan Select' is a rare selection with bright, firey red flowers with recurved tepals (frequently more twisted than the picture) and a lemon-yellow base.

Gloriosa superba 'Rothschildiana' has striking flowers with broad, bright red, rippled petals with golden yellow bases.

Gomphocarpus physocarpus (previously Asclepias) is a cool milkweed relative known as balloon plant or hairy balls!

Goodyera oblongifolia is a terrestrial orchid that spreads into small colonies of evergreen, ornately-variegated leaves.