🍒 Redstone Cornelian Cherry

Cornus mas ‘Redstone’
A heavy-cropping Cornelian cherry with large, dark red fruit: the preserves-maker’s pick for a reliable harvest.
Sun
Full sun to partial shade
Days to harvest
Fruit in late summer; trees fruit in several years
Spacing
15-20 feet apart
Soil pH
6.0-7.5
Zones
Zones 4-8; a North Florida trial only

What it looks like

Cornus mas (species) — fruits of Cornus mas photgraphed in public gardens of Saint-Pierre-le-Moutier (Nièvre)
Cornus mas, the species (no verified photo of ‘Redstone’ itself exists). Photo: B.navez, CC BY-SA 3.0.
Cornus mas (species) — European Cornel flowering (Cornus mas, Cornelian Cherry), Hesse, Germany.
Cornus mas, the species (no verified photo of ‘Redstone’ itself exists). Photo: Norbert Nagel, CC BY-SA 3.0.
Cornus mas (species) — Flower of Cornus mas
Cornus mas, the species (no verified photo of ‘Redstone’ itself exists). Photo: Uoaei1, CC BY-SA 4.0.

Why this variety

Redstone is another fruit-selected Cornelian cherry, valued for heavy crops of large, dark red fruit. Where Pioneer is the early, sweet-tart pick, Redstone is the workhorse: a tree that, once mature, loads itself with oblong cherries that cook down into deeply colored jam, syrup, and liqueur with a flavor somewhere between tart cherry and cranberry, with a floral note all its own.

Like all Cornelian cherries it is also a fine small tree in its own right — yellow late-winter flowers, dense summer foliage, long life — so it earns its space during the years before it bears heavily. Plant it with another Cornelian cherry for the best pollination, and plant it where you can reach the fruit without a ladder, because a mature tree’s upper branches will otherwise donate their crop to the birds.

Heavy crops of large, dark red fruit for preserves. Crops better with another Cornelian cherry nearby. Long-lived small tree or large shrub.

How to grow

Plant in sun to light shade in well-drained soil and prune lightly for an open, reachable canopy. Harvest by picking fully colored, slightly soft fruit — or by shaking branches over a sheet, the traditional Cornelian harvest, which is faster and more fun than it sounds.

Plant grafted trees while dormant in late winter or early spring, in full sun and deep, well-drained soil. Stone fruit drowns in wet feet faster than almost any other fruit group, so drainage is the whole game: raised ground beats a hollow every time. Prune to an open vase in the first few years so light and air reach the interior wood where fruit forms, and keep the graft union above soil level.

Florida framing, stated plainly: Redstone shares Pioneer’s North Florida trial-only status and its caveats — winter chill, heat, humidity, and bloom timing all argue against reliable Florida fruiting. North Florida trial only, with a pollination partner and well-drained soil; elsewhere in Florida, reference only.

Water & feeding

Water young trees deeply through their first two growing seasons, then water consistently through fruit development — uneven watering makes fruit split and drop. A thick mulch ring (kept off the trunk) holds moisture and suppresses weeds, and worm castings worked into the planting hole and as a spring top-dress feed the soil biology that stone fruit rewards. Skip heavy nitrogen after fruit set: it buys leaves at the expense of fruit.

Common problems

  • Brown rot — the classic stone-fruit fungus, worst in warm, humid weather. It rots blossoms and fruit and overwinters in mummified fruit left on tree or ground. Sanitation (remove mummies, fallen fruit, and diseased wood) matters more than any spray.
  • Bacterial canker and black knot — swollen, black growths on branches. Prune well below the swelling in dry weather and dispose of cuttings off-site; do not compost them.
  • Late frost on open bloom — one hard freeze after a warm spell ends the crop. Site trees where cold air drains away, not in frost pockets, and accept that some springs will simply be lost.
  • Birds and squirrels — they know ripeness a day before you do. Net before fruit colors fully if you want to taste the crop.
  • Peach tree borer and other borers — sawdust-like frass at the trunk base is the sign. Keep trunks healthy, avoid mower wounds, and remove infested wood.

Harvest

Pick when fruit colors fully, yields very slightly to pressure, and smells fragrant — stone fruit picked hard never develops full flavor, and fruit picked soft bruises in the basket. Taste one before harvesting the whole tree. Use fresh within days, or preserve promptly: jam, drying, freezing, and baking all suit stone fruit, and a glut handled the same week beats a glut left to rot on the tree.

Nerdy fact: Cornus mas is one of the earliest trees to flower in spring, often while snow is still on the ground in its home range. Its yellow flowers are not showy from a distance, but up close in late winter they are the first sign the year is turning — which is a kind of showiness all its own.

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Saving seeds

Redstone is another fruit-selected Cornelian cherry, valued for heavy crops of large, dark red fruit. Where Pioneer is the early, sweet-tart pick, Redstone is the workhorse: a tree that, once mature, loads itself with oblong cherries that cook down into deeply colored jam, syrup, and liqueur with a flavor somewhere between tart cherry and cranberry, with a floral note all its own. As a named Cornelian cherry it is kept true by grafting, not by seed — seedlings would not hold the heavy crops of large, dark red fruit. Plant grafted trees while dormant in late winter or early spring, in full sun and deep, well-drained soil. Stone fruit drowns in wet feet faster than almost any other fruit group, so drainage is the whole game: raised ground beats a hollow every time. The full method is in the Saving seeds section of the Cornelian Cherry guide.