Tree · Theaceae
Franklin Tree
Franklinia alatamaha
Late summer blooms and blazing fall color from a tree extinct in the wild since the early 1800s.
Full sun
Every 3–7 days
USDA 5–8
10–25 ft · 3–7.6 m
Overview
Few trees carry a story like the Franklin tree, a small flowering member of the tea family that survives only in cultivation and grows nowhere in the wild. John and William Bartram spotted it beside Georgia's Altamaha River in the 1760s and brought seed back with them, and that one gathering seeded every Franklinia on the planet today. The wild stand had died out completely by the early 1800s.
Its garden appeal peaks just as the season winds down. Cupped white flowers, centered on a burst of gold stamens, unfurl from late summer into early fall, and they often arrive while the foliage flames into deep red and orange. The tree keeps a tidy frame, climbing 10 to 25 feet (3 to 7.6 m) at a slow pace as a single trunk or a multi-stemmed small tree.
Reward like that comes with real work. The Franklin tree ranks as demanding to grow, picky about drainage, and fast to succumb to root rot in the wrong ground. Set it in cool, damp, sharply drained acidic soil, keep clay and heat away from it, and you earn a shot at one of the most striking trees a gardener can raise.
Care
The short version: full sun to part shade in rich, acidic, sharply drained soil that never sits wet. Hold the soil evenly damp, keep heat, drought, and clay away, and treat root rot as the enemy to beat.
Light
Set the Franklin tree in full sun to partial shade. Strong light drives the best flowering and fall color, while a touch of shade over the hottest hours steadies it in gardens where summers heat up.
Water
Hold the soil consistently moist but never waterlogged, and you have mastered the core of this tree. Drought throws it off and wet feet finish it, so keep water coming through dry spells while the ground drains freely. Standing water opens the door to the root rot that ends most Franklin trees.
Soil
Set it in organically rich, well-drained, acidic sandy loam at a pH of 4.5 to 6.0. Drainage pulls as much weight as fertility, so mix in generous organic matter and keep heavy clay far from the planting hole.
Temperature
Cold and heat both fall within its stride, spanning roughly -20°F to 95°F (-29°C to 35°C) across USDA zones 5 through 8. Long stretches of heat wear on it, so the cooler side of that band coaxes out its finest growth.
Humidity
Everyday outdoor air suits it well, with no target percentage to chase. Sharp drainage and moving air do far more good than any amount of moisture overhead.
Feeding
Feed once in spring with an acidic, slow-release fertilizer built for acid-loving plants. A single seasonal helping carries it through, and pairing the feed to its taste for acid soil keeps growth ticking along.
Pruning
This tree wants very little pruning. Cut away dead, damaged, or crossing branches in late winter, and shape it during the same window if you're bringing it up as a single-trunk specimen.
Repotting
Ground-planted trees never call for repotting, and even potted ones move up only on rare occasions. Roots winding around the pot, roots poking out the drainage holes, or water rushing straight through flag a container tree that has finally outgrown its quarters.
Size & spacing
Count on a grown height of 10 to 25 feet (3 to 7.6 m) and a spread of 6 to 15 feet (1.8 to 4.6 m). Hand it space to shine solo as a specimen, where those late flowers and that fall color pull every eye.
When to plant
Plan around a slow, cool-climate rhythm. Sow seed from late winter into early spring once it has had a cold stratification, move young trees outdoors in spring past the last frost or during early fall, and look for flowers from late summer up to the first frost.
Northern hemisphere
Southern hemisphere
Typical months for a temperate climate: start earlier in warm zones, later where spring frosts linger.
- Sow: late winter to early spring after cold stratification
- Plant: spring after last frost or early fall
- Harvest: late summer to early fall (July to first frost)
Hardiness
USDA hardiness zones: 5–8
Temperature: down to -29°C
Troubleshooting
Nearly every Franklin tree that fails does so at the roots, undone by the water around them. Get sharp at telling rot from wilt from plain drought, because each one calls for its own fix. Match your symptom to the list below and move fast, since this tree hands out very little slack.
Fast wilt and branch loss over rotting dark roots
Watch for Phytophthora root rot, which claims more Franklin trees than anything else and thrives wherever soggy, compacted, or clay ground traps water at the roots. Scrape away the soil and the roots come up dark and mushy with a stained crown just above them. A tree this far gone rarely pulls through, so sharpen the drainage right away, lift any survivors onto a raised mound of loose acidic soil, and dig out the sickest ones before the rot travels.
Fix:
- Improve drainage immediately and stop overwatering
- Plant or transplant into a raised bed or mound of well-drained, organically rich acidic soil
- Remove and destroy severely affected plants to limit spread
Wilt taking hold though the soil drains cleanly
A Franklin tree that droops while its soil drains freely and stays evenly damp points you toward wilt disease, which comes down hard on this species, or toward straight drought stress, since dry ground undoes the tree fast. Snip out the ailing branches, bag them, and hold the soil at a steady moisture that never turns wet. Keep the tree in a cool, damp, sharply drained acidic pocket and shield it from heat, drought, and pollution, and you head off most of the trouble.
Fix:
- Remove and dispose of affected branches
- Maintain even soil moisture without waterlogging
- Avoid stressing the plant with drought, heat, or transplanting
Foliage chewed to lace and notched at the edges
Tattered leaves eaten down to their veins point to sawfly larvae working the foliage right through the growing season. A young tree lets you take charge easily: pluck the larvae by hand or blast them off with a sharp stream of water. Hold any insecticide back for a real infestation, and keep checking the leaves so you spot the larvae the moment they arrive.
Fix:
- Hand-pick larvae from small trees
- Use a strong spray of water to dislodge larvae
- Treat with an appropriate insecticide only if infestation is heavy
Toxicity
Households with animals can relax: the Franklin tree is not toxic. Cats and dogs won't find it on the poison lists, and the same clean bill covers every other creature that roams a garden. A pet that chews a leaf might get a passing stomach grumble from the roughage, and that's the whole story.
Safe for
People · Cats · Dogs · Horses · Rabbits · Livestock · Birds
Cats Safe
No toxin lives in the Franklin tree, so a cat that swats and chews a leaf comes away unharmed. Down a big wad of any non-food plant and you might see a bit of drool or a passing queasy spell that settles by itself.
Dogs Safe
A dog can gnaw the leaves and stay fine, because this tree never made the lists of plants that poison them. Push it to a full feast and the worst you might get is a short bout of vomiting that clears fast.
Horses Safe
Leaves, bark, and flowers all check out clean for horses, so a nibble grabbed in passing does no harm at all.
Rabbits Safe
A rabbit can browse the leaves with nothing to worry about. Treat it like any fresh green and offer just a little at the start so the gut eases into it.
Livestock Safe
Cattle, goats, and sheep run no risk of poisoning from this tree, and a random mouthful cropped in the pasture leaves them none the worse.
Birds Safe
Birds meet no chemical threat here, whether they roost in the branches or peck at the ripening seed capsules.
People Safe
Not one part of the Franklin tree carries poison for people. It grows for its flowers rather than the table, though, so keep it out of the kitchen.
No special handling precautions are required for pets, though ingestion of any non-food plant can cause mild stomach upset.
Varieties
The species itself carries no garden cultivars, though one hybrid and a handful of close kin in the tea family reward a closer look.
x Gordlinia grandiflora (Mountain Gordlinia)
Born at NC State in 2002 from a cross of Franklinia and Gordonia, this semi-evergreen hybrid outpaces both parents in speed and opens bigger blooms that reach 5 inches (13 cm) wide.
Gordonia lasianthus (Loblolly Bay)
An evergreen cousin in the same tea family whose hardiness went straight into the Gordlinia cross as one of its parents.
Schima and Stewartia relatives
Schima and Stewartia fill out the Franklin tree's near relations in the tea family (Theaceae), and Schima joins Gordonia and Franklinia in the tribe Gordonieae.
How to propagate
Raising more Franklin trees rewards patience and a thick skin for setbacks. Seed is the dependable path, while cuttings stay a gamble worth taking only when you have spare plants to risk.
SeedModerate
Sow in late winter to spring after cold stratification · Several years to reach flowering size
Seed is the tried route to a new Franklin tree, pulled from the woody capsules the same way every plant in cultivation descends from that first Bartram collection. Chill the seed through a stretch of cold stratification, then sow it from late winter on into spring. Settle in for the wait, because a seedling takes several years to grow up to flowering size.
Stem cuttingsDemanding
Softwood cuttings in summer · Slow and challenging to root
Give softwood cuttings taken in summer a go as well, but brace for a slim strike rate. They root at a crawl and dig in their heels, and this species resists establishing by any means, so plan to lose several before one finally catches.
Myths
Franklin trees are still out there growing wild along Georgia's Altamaha River.
No wild specimen has turned up since the early 1800s, and search after search along the river has come back empty. Every Franklin tree growing now springs from the seed the Bartrams gathered before the species disappeared from the one place it ever called home.
A sought-after rarity like this simply has to grow with ease wherever it lands.
Being rare tells you nothing about how tough a plant is to grow, and this one has a reputation for testing gardeners. Root rot takes it down quickly, and it refuses clay, wet feet, drought, heat, and pollution alike. Set it in cool, damp, sharply drained acidic soil or watch it slip away.