Photo by Melody

PlantFiles: Rodway Black Gum
Eucalyptus aggregata

Family: Myrtaceae (mir-TAY-see-ee) (Info)
Genus: Eucalyptus (yoo-kuh-LIP-tus) (Info)
Species: aggregata (ag-GRE-gat-uh) (Info)


over 40 ft. (12 m)

30-40 ft. (9-12 m)
over 40 ft. (12 m)

USDA Zone 8a: to -12.2 C (10 F)
USDA Zone 8b: to -9.4 C (15 F)
USDA Zone 9a: to -6.6 C (20 F)
USDA Zone 9b: to -3.8 C (25 F)
USDA Zone 10a: to -1.1 C (30 F)
USDA Zone 10b: to 1.7 C (35 F)
USDA Zone 11: above 4.5 C (40 F)

Sun Exposure:
Full Sun

Unknown - Tell us

Bloom Color:
White/Near White

Bloom Time:
Unknown - Tell us

Grown for foliage

Other details:
Average Water Needs; Water regularly; do not overwater
Requires consistently moist soil; do not let dry out between waterings

Soil pH requirements:
5.1 to 5.5 (strongly acidic)
5.6 to 6.0 (acidic)
6.1 to 6.5 (mildly acidic)
6.6 to 7.5 (neutral)
7.6 to 7.8 (mildly alkaline)

Patent Information:
Unknown - Tell us

Propagation Methods:
From seed; stratify if sowing indoors
From seed; sow indoors before last frost

Seed Collecting:
Allow pods to dry on plant; break open to collect seeds
Seed does not store well; sow as soon as possible

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No positives
1 neutral
No negatives

Gardeners' Notes:

Neutral Lodewijkp On May 2, 2013, Lodewijkp from Zwolle
Netherlands (Zone 7a) wrote:

Grown it from seed...

i read from numerous sources that's its likely a hardy euc. a nursery here in the netherlands had 2 and 3 year old trees which survived -15 C almost undamaged. however like other eucalypts,seed source is important and you probably need seeds from trees that grow in cold regions. some E.gunni seedlings die at -5 C and other survive -10 undamaged.

my 2 month old seedlings survived a -5C freeze undamaged , that says something. anyway this one likes moist conditions, almost swamp like conditions. it grows way faster than other eucalyptus trees. i think it's just as fast as eucalyptus globulus. it has a willow like appearance ,very ornamental.

regarding sowing... i have stratified it for a few weeks ( 4 weeks ) but some batches germinated better without stratification. so im not sure if you should stratify the seeds - i think it's better to stratify 50 % of your seeds and direct sow the other ones.

threatened/vulnerable in its natural habitat.. and likely to be very hardy..

quote from wikipedia. :

It is a rare species found from Capertee and Bathurst in central New South Wales, south through central and southern tablelands,[4][3] with an isolated population near Woodend in Victoria.[2] It has a very patchy and scattered distribution, as much of the land throughout its range has been cleared for agriculture.[4][5] Eucalyptus aggregata grows in woodland and is associated with candlebark (Eucalyptus rubida), ribbon gum (E. viminalis), black sally (E. stellulata) broad-leaved peppermint (E. dives) and snow gum (E. pauciflora), with a grassy understory of river tussock (Poa labillardieri) and silver top wallaby grass (Joycea pallida).[4][5] The soil is generally poorly drained, alluvial or swampy, with the black gum growing in low-lying areas. These are also natural frost hollows, where cold air persists in the cooler months.[5] It is found at altitudes above 700 metres (2,300 ft), where there are heavy frosts and snow in winter.[2]

Most of the extant population, estimated at 6300 to 8100 mature trees, are isolated. Their seedlings cannot compete against surrounding weeds. These trees are also threatened by hybridisation with E. viminalis and E. rubida. Climate change may also reduce the extent of frost hollows as the climate warms. The NSW Scientific Committee of the Department of Environment and Heritage in the New South Wales Government have proposed the black gum be listed as vulnerable.[5]

from hardy eucalyptus page :

Eucalyptus aggregata - Black Gum (southeast Australia, not including Tasmania) This is a medium-sized, hardy tree, branching almost to ground level, with fine little dark green leaves, a wide crown of dense foliage that casts good shade, and rough, dark bark. It often grows on flat land where cold air gathers at relatively high elevation, and is esteemed for its capability to withstand very poor drainage and flooding. Although sometimes considered synonomous with the closely related E. rodwayi, the two are distinct. It is hardy enough to grow throughout zone 8 and should be tested in colder areas. -3 to +8F.


This plant has been said to grow in the following regions:

Sulphur, Louisiana

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