Seeds and cuttings I collect around North Carolina, what they turned out to be, and how to grow them for a NC Piedmont native-plant nursery.
Vitis rotundifolia · Vitaceae
The one wild grape callable in a single second: its tendrils don't fork. Tight warty bark, palm-sized round leaves, and a few enormous thick-skinned berries that drop to the trail one at a time.
Community photos of Vitis rotundifolia to study before I head out: leaf, flower or bract, ripe fruit, bark, whole plant.
Ubiquitous in NC and the single most common grape in the state, documented in all three regions (Coastal, Piedmont, Mountains). Alamance County alone carries 228 iNaturalist observations (141 research-grade), against 4 for summer grape, 5 for frost grape and 3 for fox grape. In Saxapahaw, muscadine is the default grape and a forked tendril is the surprise
Best bet: Two-track the same trip. Seed: mash and float the pulp off, keep the sinkers, cold-moist stratify the cleaned seed ~90 days at ~40°F in damp vermiculite, sow in spring. Clone: while standing at a proven fruiting female, peg a current-season shoot into a 4–6 in trench of moist duff, wound a node, leave the tip out, weight it with a rock, then sever the rooted layer next dormant season. Layering is the only reliable way to clone muscadine without a mist bench; dormant hardwood cuttings are famously near-impossible.
A Piedmont native at the dead center of its range, comfortable in zone 7b/8a heat, humidity and heavy clay, and genuinely resistant to Pierce's disease, black rot and the rest of the Southeastern grape disease load, which no bunch grape is. Three real cautions: it needs full sun and honest drainage to fruit at all (pH ~5.5–6.5); it is enormous and heavy, so build the arbor before planting; and wild seedlings segregate, so plant several and expect 50–75% of them to turn out male and never fruit. Keep at least one male in the block as a pollinizer.
Each look-alike with the one character that settles it. Tap a photo to zoom.
Forked (branched) tendrils and shreddy peeling bark, against muscadine's simple tendril and tight warty bark. Also bigger, often 3-lobed leaves with a whitish-to-rusty bloom beneath, and small berries in a long tight bunch. Only 4 Alamance County records against muscadine's 228.
A tendril or flower cluster at every node, opposite three or more consecutive leaves, which no other grape does. Forked tendrils, shreddy bark, leaf undersides densely white-to-rusty felted. Muscadine's tendrils skip nodes, don't fork, and its leaf back is essentially smooth.
Forked tendrils and shreddy bark again, plus glossy, hairless, sharply toothed heart-shaped leaves and small black grapes in large clusters that hang past frost, against muscadine's blunt-toothed round leaf and few huge berries gone by October.
The deadly grape mimic; 10 records in Alamance County, and it's already collection 05. Any one of three settles it: no tendrils at all, since it twines; leaf margin entire and untoothed, with the petiole set slightly inside the blade; and one flat crescent seed per blue-black fruit instead of muscadine's several boat-shaped seeds. Never eat a wild "grape" without cutting a fruit open first.
Slice the stem: porcelainberry's pith is white, every true grape's is brown. Backed up by the fruit, speckled berries in turquoise, lilac, pink and white all on one cluster, against muscadine's uniform bronze or purple-black.
Leaves bipinnately compound and lacy, a spray of many small leaflets, against muscadine's single round simple blade. Its blue-black drupes are small, flat-topped and bitter, held in flat-topped clusters.
The commonest vine on the trail (115 Alamance records) and blue-black-fruited. Palmately compound leaves of 5 leaflets, and tendrils that end in sticky adhesive pads. Muscadine has one simple blade and bare coiling tendrils.
Name note. USDA, iNaturalist and NC Extension all still write Vitis rotundifolia Michx., the name used throughout this guide. Weakley's Flora of the Southeastern US segregates it out of Vitis as Muscadinia rotundifolia (Michx.) Small var. rotundifolia, on the same list of characters I'll be using in the field: 2n = 40 chromosomes against Vitis' 38, no nodal diaphragms in the pith, simple rather than forked tendrils, bark that doesn't shred, pulp that clings to the seed. Same plant under two names.
Muscadine doesn't need hunting in Saxapahaw. It needs filtering. It's far and away the commonest grape on the Haw, and the work is finding a vine that's female, in the sun, and fruiting right now.
Walk looking down. The berries abscise one at a time and hit the ground rather than ripening as a bunch. A scatter of fat, single, thick-skinned grapes on the trail tread, marble-sized, bronze or dull purple-black, is the most efficient thing to look for on this hike. Find the drops, then look up.
Then look up, at the edges. Muscadine climbs 60–90 feet and drapes whole riverbank trees, but it only fruits in sun, so the vines curtaining the shaded floodplain interior will be all foliage. Work the sun-struck seams: the bluff edge above the river where the canopy opens, gaps blown out by fallen sycamores, the powerline cut, old-field margins, the mill-race edge, the trail shoulder.
Accept that most vines are male. Wild muscadine is functionally dioecious and roughly 50–75% of wild vines are staminate. They flower in May–June, pollinate everything around them, and set nothing. A vine can't be sexed off its leaves, so fruit on it means female and that's the whole test. Expect several barren vines per fruiting one, and mark the heavy female.
The three other grapes, summer (V. aestivalis), fox (V. labrusca) and frost (V. vulpina), all share one pair of characters against muscadine: forked tendrils and shreddy bark. Muscadine's tendril is simple and its bark is tight. Secondary separators: fox grape puts a tendril or flower cluster at every node, opposite three or more consecutive leaves, which nothing else does, and felts its leaf backs white-to-rusty; summer grape runs larger, often 3-lobed leaves with a bloom beneath; frost grape has glossy hairless leaves with sharp teeth and black grapes hanging past frost. Alamance County numbers are lopsided: 228 muscadine records against 4, 3 and 5.
Canada moonseed (Menispermum canadense) is the confusion that actually matters. Already in hand as collection 05; 10 records in Alamance County, and it grows in the moist floodplain ground the trail runs through. Its blue-black fruits look like small wild grapes and the fruit has killed children (dauricine plus berberine-type alkaloids, cardiac arrhythmia and seizures). Three independent checks, any one of which settles it:
Porcelainberry (Ampelopsis glandulosa), non-native invasive, 3 Alamance records. Slice the stem: the pith is white, and every true grape's is brown. Confirmed by fruit, speckled turquoise, lilac, pink and white berries all on one cluster.
Peppervine (Nekemias arborea), 4 Alamance records, and it genuinely tangles into muscadine (there's an iNat photo of muscadine berries hanging through a peppervine). Leaves bipinnately compound and lacy, a spray of small leaflets, against muscadine's one round simple blade.
Virginia creeper (Parthenocissus quinquefolia), the commonest vine I'll actually touch on this trail (115 Alamance records), also blue-black-fruited. Palmately compound, 5 leaflets, and tendrils tipped with sticky adhesive pads.
Weakley gives fruiting as Aug–Oct, Will Cook puts NC ripening at Aug–Sep, and commercial NC harvest runs late August into early October. Mid-to-late August in the Piedmont is the front edge of peak.
Take fully colored, soft, aromatic berries that release at a touch, plus fresh same-day drops off the ground. Hard green berries have immature embryos. Berries ripen unevenly, so a good vine gives a second and third picking over the following weeks.
Field trick: spread a jacket or tarp under a loaded vine and shake it. That's how muscadine is commercially harvested, precisely because ripe berries abscise individually. The ripe ones drop, the unripe ones stay put.
For that vine, the proven female with good fruit, seed won't give it to me and cuttings probably won't either. Layer it while standing there.
Dormant hardwood cuttings are notoriously close to impossible; the standing recommendation is to use softwood cuttings or layering instead, and recent Arkansas work optimizing a hardwood protocol was newsworthy because it's so difficult. Don't build a plan on it.
The route that works needs a mist bench: softwood or semi-hardwood cuttings taken late May–early August, cut to 3–4 node sections (4–6 in), inserted to about half their length (roughly two nodes buried) in a 1:1:1 peat:sand:bark mix around pH 6, under intermittent mist (~5 seconds every 10 minutes), rooting in 6–8 weeks. A next-June job, which is why layering is the move today.
Start at the Saxapahaw Mill Race Paddle Access: cross Church Road at the crosswalk, follow the sidewalk, drop in at the metal staircase onto the Haw River Trail's Saxapahaw section (~6.3 miles out-and-back, easy). Add Saxapahaw Island Park with its boardwalk and river deck.
Then ignore the shaded interior and work the light:
Eyes on the tread for dropped berries, then stop and look straight up. On a heavy fruiting female: pick it, peg a layer at its base, drop a pin. Back in two weeks for the second flush, and again in December for the rooted layer.