Thomson Number 7 Dragonfruit is a Mexican climbing cactus that produces stunning night-blooming flowers followed by sweet, orangish-red fruits ready to harvest just 32 days after pollination. Named after Paul Thomson's seminal work on pitayas, this variety from Jalisco State combines ornamental drama with reliable fruit production, thriving in full sun with minimal water once established. Its slow but sturdy growth and exceptional cold tolerance make it surprisingly adaptable for gardeners willing to wait for the spectacular payoff.
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Large 15-inch night-blooming flowers with white petals and striking red-and-yellow outer sepals open above girthy, three-sided stems wrapped in heavy grayish-white wax. The oval fruits develop an orangish-red skin dotted with small green fins and deliver a consistent sweetness (averaging 18 Brix, sometimes reaching 21), all while the plant's waxy coating and naturally shedding thorns make it increasingly user-friendly as it matures.
The sweet fruits are eaten fresh, either scooped straight from the skin or sliced and added to fruit platters and desserts. The high Brix content (18 to 21) makes the fruit suitable for blending into smoothies and juices where the natural sweetness requires minimal additional sugar.
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Dragonfruit flowers typically open 21 days after the bud emerges, and fruits are ready to harvest approximately 32 days after successful pollination. Pick fruits when the skin has developed a deep orangish-red color and the body yields slightly to gentle pressure; the small green fins should still be visible and firm. Cut the fruit from the stem rather than pulling to avoid damaging the plant.
Minimal pruning is needed due to the slow growth habit, but guide the climbing stems along your trellis as they develop, securing them loosely to prevent damage. As the plant matures, thorns naturally shed and do not reappear, making maintenance safer over time.
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“Thomson Number 7 takes its name from Paul Thomson's influential book Pitahaya, a foundational text on dragonfruit cultivation and varieties. This cultivar originates from Jalisco State in Mexico, where it evolved as a regional adaptation of Hylocereus ocamponis. DNA testing has confirmed it as a distinct variety, closely related to but genetically separate from another Mexican pitaya called El Grullo, establishing its place within the dragonfruit family tree as a variety with proven heritage and documented botanical distinction.”