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Sourwood
A choice native small tree with true four-season beauty - drooping sprays of white summer flowers that make the prized sourwood honey, followed by some of the earliest and most brilliant scarlet fall color of any tree, all on a gracefully leaning, sculptural frame.
Safety notes Sourwood is safe to grow and handle - it's an ornamental and honey tree, not a food plant. Its summer flowers yield the famous, prized 'sourwood honey' via bees (the tree itself isn't eaten). Its sour taste is oxalic acid; the leaves were once chewed or brewed as a folk remedy but are not recommended today, especially if you are prone to kidney stones. The main practical need is acidic, well-drained soil; it dislikes pollution, drought, and root disturbance - a siting matter, not a hazard.
Overview
Sourwood (Oxydendrum arboreum) is one of the finest native small trees of the Southern Appalachians - a slow-growing, gracefully leaning, picturesque tree (25-40 feet) that offers something in every season. In midsummer, when few trees bloom, it drapes itself in long, one-sided, drooping sprays of small white urn-shaped flowers, like lily-of-the-valley cascading from the branch tips (hence its other name, the lily-of-the-valley tree). Those flowers are the source of the famous, prized sourwood honey.
The one thing to knowSourwood (Oxydendrum arboreum) is one of the finest native small trees of the Southern Appalachians - a slow-growing, gracefully leaning, picturesque tree (25-40 feet) that offers something in every season.
Quick facts
- Sprouts in
- 60 daysRange: 30–120 days
- Soil temperature
- 70 °FRange: 60–78 °F
- Height
- 30 ftRange: 25–40 ft
- Spread
- 20 ftRange: 15–30 ft
- Cold
- Takes hard frostdamaged below -15°F
- Heat
- Struggles above 100°F
- Life cycle
- Perennial, lives about 100 years
- Save seeds
- About 150 days after plantingRange: 120–180 days
- Self-sows
- Yes, expect volunteers
- Soil
- Well-drained
- Water
- Medium
- Plant spacing
- 20 ftRange: 15–30 ft
When to plant
Fall sowing is open for 26 more days. Next: spring, Mar 27 to May 22.
- Direct sow Oct 11 – Nov 15 Open now · 26 days leftAbout 2 weeks before to 3 weeks after your first frost (Oct 25 here)Surface-sow the tiny seeds on acidic, moist, humus-rich ground in fall or late winter; sourwood seed is dust-fine, needs light and moisture to germinate, and is slow. Transplants are far faster and more reliable to a usable tree.
- Transplant Mar 27 – May 22 Opens in 158 daysAbout 2 weeks before to 6 weeks after your last frost (Apr 10 here)Plant a young container sourwood in spring into acidic, well-drained, humus-rich soil in full sun to part shade; plant small, since it resents transplanting. Spring planting lets it establish before winter.
- Transplant Aug 26 – Oct 4 Opens in 310 daysAbout 9 weeks before to 3 weeks before your first frost (Oct 25 here)Fall planting works in milder zones; keep the roots moist and the soil acidic through establishment, and disturb the roots as little as possible.
Frost here: last around Apr 10 (Mar 27 to Apr 24 most years), first around Oct 25. Zone averages, your own yard may run a week or two either way.
Life stages
Establish, grow, repeat
Getting established and returning each season are different parts of the story.
Stage 1 of 4 · Getting established
Years 1-3 - slow young tree
About the first 3 years after planting
Care at this stage
-
Water while establishing, in acidic soil
Water a young sourwood deeply and regularly through its first 2-3 years, keeping the soil moist but never soggy. It's a heath-family tree that needs acidic, well-drained, humus-rich soil (like its relatives blueberry and rhododendron), and resents transplanting - so plant it small and disturb the roots as little as possible.
-
Mulch with an acidic mulch
Mulch the root zone with pine straw, shredded leaves, or bark to keep the roots cool, moist, and acidic; keep it back from the trunk. Sourwood dislikes competition, so keep grass and weeds off its root zone while young.
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Site it in acidic soil, away from pollution and disturbance
Sourwood is a slow-growing small tree (25-40 feet) that needs acidic, well-drained soil and full sun to part shade for best flowering and fall color. It dislikes air pollution, road salt, drought, and root disturbance, so it's a poor street tree - give it a sheltered, acidic, undisturbed spot as a specimen or woodland-edge tree.
Months are typical seasonal windows; climate, variety, and plant age can shift them.
Watch out for
3 to know. None are high-risk for Sourwood. None are active in October.
Chlorosis (Non-Acidic Soil)Severity Medium DisorderSeason: May–AugPale yellow leaves with green veins (interveinal chlorosis), especially on new growth, plus weak growth, sparse flowering, and muted fall color on neutral or alkaline soils.
Pale yellow leaves with green veins (interveinal chlorosis), especially on new growth, plus weak growth, sparse flowering, and muted fall color on neutral or alkaline soils.
Acidify the soil with elemental sulfur and an acid-forming (heath/blueberry-type) regimen, apply chelated iron as a stopgap, and mulch acidically; the durable fix is siting it in genuinely acidic ground.
Plant sourwood only in acidic, well-drained, humus-rich soil; use an acidic mulch (pine straw, shredded leaves), avoid liming near it, and test soil pH before planting.
Sourwood is a heath-family tree that needs acidic soil; on neutral or alkaline ground it can't take up iron and other nutrients properly, causing yellowing leaves (with green veins), poor growth, weak flowering, and dull fall color - the most common reason a planted sourwood fails to thrive.
Drought StressSeverity Low DisorderSeason: Jun–SepWilting on hot afternoons, browning and crisping along leaf edges and tips, premature leaf drop, collapsed flower stems, and thin, stunted growth - showing up first on young plants and on the driest, most exposed side of the planting.
Sourwood is drought-sensitive while young and repays a deep mulch. Chronically dry, exposed sites are simply unsuitable for it; on a good site an established tree recovers by the following season.
Wilting on hot afternoons, browning and crisping along leaf edges and tips, premature leaf drop, collapsed flower stems, and thin, stunted growth - showing up first on young plants and on the driest, most exposed side of the planting.
Water deeply and consistently, then mulch. Mild wilting reverses within a day or two, but a prolonged drought sets a plant back hard and can kill a young one outright. If a plant scorches every summer, the site is wrong - move it to damper ground rather than trying to water it through.
Match the site to the plant: put a moisture-loving species where the ground actually stays damp - a rain garden, pond edge, ditch, seep or low spot - rather than in an ordinary border you intend to keep watered. Mulch to hold moisture and keep the roots cool, water deeply through every dry spell while the plant is establishing, and avoid hot, windy, exposed positions.
Not a pest but a siting problem, and on a moisture-loving plant it is usually the thing that actually kills it. When the soil dries out, leaf edges brown and crisp, foliage wilts and drops early, flowering and fall color are cut short, and growth thins. Hot sun, wind and exposed positions make it worse by pulling water out faster than the roots can replace it. A plant that wants reliably moist or wet ground has no drought tolerance to fall back on, and young or recently planted ones have the least of all.
Fall WebwormSeverity Low PestSeason: Jul–SepLoose, dirty-white silken webs enclosing branch tips and the leaves within them, with caterpillars feeding inside, appearing in late summer.
Loose, dirty-white silken webs enclosing branch tips and the leaves within them, with caterpillars feeding inside, appearing in late summer.
Prune out and destroy the webbed branch tips on small trees if desired, or simply tolerate them - the damage is cosmetic and late-season, and the tree recovers fully. Bt controls young caterpillars if warranted.
Encourage the many birds and parasitic insects that control webworms; tolerate light infestations, which do little harm so late in the season.
Caterpillars that build conspicuous silken webs (nests) enclosing the ends of branches in late summer and feed on the leaves inside; unsightly but rarely harmful to an established tree, which is heading into dormancy anyway.
Good & bad neighbors
Plant nearby
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A fellow heath-family (Ericaceae) native that shares sourwood's need for acidic, well-drained soil - a natural pairing, since both thrive in the same acidic conditions and both are valuable to pollinators, with overlapping habitat.
-
A native pollinator perennial that blooms in summer alongside sourwood, together making a strong nectar planting for bees and hummingbirds - a fitting companion for the great honey tree.
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A native understory tree that shares acidic woodland-edge conditions and, like sourwood, offers strong seasonal interest - dogwood's spring flowers and sourwood's summer bloom and fall color layer the season in a woodland planting.
- Traditional pairings, thin evidence
-
A native understory shrub of moist, acidic woodland edges that pairs naturally with sourwood in a native woodland-edge planting, adding an early-flowering, butterfly-host layer beneath and beside it.
Varieties · 3
You pick one when you add Sourwood to your garden. Its days to maturity set your harvest window.
Sourwood (Oxydendrum arboreum)
The wild species and the only species in its genus: a slow-growing, gracefully leaning native small tree (25-40 feet) with drooping white summer flowers (source of prized sourwood honey), spectacular early scarlet fall color, and persistent tan seed sprays.
Variety details for Sourwood (Oxydendrum arboreum)
Leaning, picturesque small tree with drooping white flower sprays and brilliant scarlet fall foliage.
speciesnativehoney-plantbrilliant-fall-colorA superb four-season specimen for acidic, well-drained soil.
Chameleon
A more upright, narrow, columnar sourwood selection with a tidier form than the leaning species and excellent fall color - a good choice for smaller gardens or where a more vertical, uniform shape is wanted while keeping sourwood's flowers and autumn fire.
Variety details for Chameleon
Narrow, upright sourwood with white summer flowers and brilliant fall color.
cultivarcolumnaruprightsmall-spaceMount Charm
A selection noted for especially early and reliable brilliant red fall color and a good specimen form - chosen where dependable, early autumn color is the priority, on a vigorous, well-flowering tree.
Variety details for Mount Charm
Vigorous sourwood with early, dependable scarlet-red fall color.
cultivarearly-fall-colorreliablespecimen
Grower tips
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