Gardens are more interesting for a touch of the exotic, and if you appreciate the occasional challenge, torch lilies (Kniphofia cvs.) satisfy on both fronts. Their lush, reedy foliage and spires of tubular flowers in shades of cream and yellow, apricot, orange and fiery red have a tropical look. And coming as they do from southern Africa, torch lilies are anything but a sure thing in winter-wracked climates. Still, if my and my partner's experience holds true, they may well live for years in cold Canadian gardens—some of the clumps in our Zone 4b garden are into their third decade.
The tapered shape and warm colouring of Kniphofia (pronounced knee-FOE-fee-ah) have given rise to the common names poker plant, flame flower and red-hot poker. As with many marginally hardy perennials, the secrets of success are perfectly drained soil and winter protection, either in the form of a consistent snow blanket or protective mulch. Sun for six or more hours daily is also a requisite for growing these African beauties.
Around spring's frost-free date, plant torch lilies, either as potted young plants or bare-rooted, in soil that is naturally sandy or lightened with crumbly compost and/or sand; avoid adding peat moss and heavy-clogging manure, since both keep the ground too moist. Give each plant room—a diameter of about 60 centimetres—as crowding impedes growth and distorts the flower spikes. Choose a front-row position for shorter varieties (up to 60 centimetres) and mid-border for the taller torches, and plant low sun-loving perennials such as candytuft, catmint, creeping phlox, lavender or dwarf geraniums in front. You don't want to hide the narrow, grassy leaves, which, like a stiff daylily, remain green and attractive from May to November. With luck, you'll see a torch or two the first year; and if soil conditions are met and winter is not too fierce, clumps will grow more robust and floriferous with each passing season.
The stark reality is this: if torch lily roots sit in water over winter or freeze solid, they die. In regions where snow comes early and stays late (as it does here), the ground may not freeze at all and plants will come through unharmed. Otherwise, mulch must be on the menu. Sometime in November, before frost has penetrated the ground, lay down a thick layer—15 to 20 centimetres is not too much—of fluffy mulch, such as dry leaves or peat moss, evergreen needles, compost, sawdust or straw. Leave the plant's foliage in place, tied midway up like a ponytail. Spread mulch in a wide doughnut, leaving a five-centimetre gap between the mulch and the plant (to discourage rot and disease) and extending out for at least 30 centimetres all around the crown. Come spring, cut foliage to ground level, gradually remove mulch as the days warm up, until the ground is fully exposed to the sun's warmth—and cross your fingers. Chances are good that new green blades will poke through, and torch lilies will be lighting up your garden for another summer.
Torch lily cultivars
Depending on the type, torch lilies flower from mid-June to late September. While those listed below are recommended for Zone 6, with proper care and protection, they're worth trying in colder zones (we grow several in our Zone 4b garden).
• ‘ALCAZAR'
290 to 120 cm, bright red, July
• ‘BRESSINGHAM COMET'
260 to 90 cm, tangerine, August/September
• ‘GREEN JADE'
290 cm, greenish ivory, August
• ‘LITTLE MAID'
245 to 60 cm, creamy yellow, July/August
• ‘NANCY'S RED'
260 cm, scarlet, August
• ‘PERCY'S PRIDE'
290 to 120 cm, greenish yellow, August/September
• ‘PRIMROSE BEAUTY'
290 cm, clear light yellow, August (a standout in our garden)
• ‘ROYAL STANDARD'
290 to 120 cm, red and yellow, July
• ‘SHINING SCEPTRE'
290 cm, light orange, July
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