The following lists of species that will thrive in specific situations are not all-inclusive.  They are intended only as a general guide to help determine what species of euc will do best in your garden.  They are recommendations for species that will do well in that situation based on their range of adaptability.

SITE refers to the specific place in which the tree is to go.  It includes factors that directly affect the immediate environment of the tree.  Such factors would include soil quality, the amount of available sunlight in the site, and other aesthetic and utilitarian considerations regarding the tree's intended use in the landscape.

Exposure considerations:

• Sunny vs. shady sites: As a general rule, eucs are sun-lovers.  In maritime climates they will tolerate any amount of sun, and most despise shade.  In hot, low-latitude climates, many of the species which thrive under cooler conditions will tolerate a little more shade.  No species will grow in deep shade.  The two most shade tolerant hardy eucs are E. crenulata and E. neglecta.  E. regnans, E. obliqua, E. fastigiata, and some related species are also a little more shade tolerant than most.
• Wind exposed sites: This is generally easy to figure out by assessing what species grow in exposed alpine sites in habitat, and which grow in forests.  Forest-dwelling species tend to be the taller ones and are not suitable for wind-exposed areas.  Some good species for generally exposed sites would include E. apiculata, E. approximans, E. coccifera, E. cosmophylla, E. dendromorpha, E. elaeophloia, E. glaucescens, E. gregsoniana, E. gunnii ssp. archeri, E. kitsoniana, E. kybeanensis, E. lacrimans, E. mitchelliana, E. moorei, E. parvula, E. pauciflora and its subspecies, E. perriniana, E. rubida, E. rupicola, E. saxitilis, E. scoparia, E. spectatrix, E. stricta, E. triflora, E. urnigera, E. vernicosa and E. willisii.
• Sites with salty air: Generally, species that have thicker leaves such as the snow gums (E. pauciflora and its subspecies) have proven tolerant of these conditions, as well as E. globulus and E. cosmophylla.  Some other good prospects might include E. cordata, E. brookeriana, E. willisii, E. nitida, and other coastal and Tasmanian species.  There are probably a lot of other species that would also be suitable so I would encourage experimentation in this area.

• Dry soils: There are a large number of drought tolerant eucs, though some species require moist soil.  Of the tender species from northern and western Australia, there is an especially high proportion of drought tolerant eucs.  This is why they are so successful when planted in Mediterranean areas.  Some of the  species covered on this page that I would recommend for drier sites would include E. acaciiformis, E. aggregata, E. amygdalina, E. apiculata, E. approximans, E. badjensis, E. barberi, E. blaxlandii, E. camphora, E. cinerea, E. cosmophylla, E. dalrympleana, E. deuaensis, E. dives, E. glaucescens, E. goniocalyx, E. gregsoniana, E. gunnii and its subspecies, E. lacrimans, E. leucoxylon, E. mannifera and its subspecies, E. melliodora, E. nicholii, E. nitida, E. nova-anglica, E. ovata, E. paliformis, E. pauciflora and its subspecies, E. polyanthemos, E. pulchella, E. radiata, E. rodwayi, E. rubida, E. scoparia, E. smithii, E. tenuiramis, and E. youmanii.
• Waterlogged soils: Many eucs will grow on soils that are either seasonally or permanently waterlogged.  Such species include E. aggregata, E. barberi, E. brookeriana, E. cadens, E. camaldulensis, E. camphora, E. cephalocarpa, E. cinerea, E. consideniana, E. cordata, E. cosmophylla, E. crenulata, E. gunnii and its subspecies, E. johnstonii, E. kitsoniana, E. macarthurii, E. microtheca, E. moorei, E. morrisbyi, E. neglecta, E. nova-anglica, E. ovata, E. parvula, E. rodwayi, E. stellulata, E. strzeckelii, E. subcrenulata, E. vernicosa, and E. yarraensis.  Generally any species referred to as a "swamp gum" will tolerate waterlogging.  No euc can be guaranteed to grow in seasonally flooded areas, but E. camphora ssp. camphora, E. neglecta and perhaps a couple others might be worth trying in these extreme conditions.
• Poor soils: With a few exceptions, all eucs generally tolerate poor soils.  If your soil is poor you can probably grow just about any euc if you mulch it.  Some of the blue gums and other species which require cooler, moist climates are a little less tolerant of poor soil.
• Rich soils: Some species do not thrive on rich organic soils such as those found on valley floors.  They require gritty soil with less organic matter to perform well.  Any species called "ash" or "mallee ash", and a few other alpine mallees might be difficult to grow in rich heavy soils.
• Clay vs. sand: Most species grow fine on clay, but some of the ashes and other rare species such as E. olsenii are difficult to grow on clay since they require a more gritty soil similar to the alpine situations where they are native.  All species grow fine on sandy soils, but if it is a very dry climate, they may not survive without a lot of irrigation.  Sandy soils lose moisture very quickly, so if the tree is likely to dry up because of the climate, than any species that is not drought tolerant will require irrigation throughout the tree's life.
• Soils with high pH: E. cordata, E. dalrympleana, E. macarthurii and E. parvula have all been shown to do fine on soils of high pH.  It seems that many additional species will also grow on high pH soils, becoming chlorotic after planting out but recovering once they are well established.  There is much research yet to be done in this area.

• Eucs for small spaces: The following species will truly not outgrow their listed height of 15 - 20' or so: E. apiculata, E. gregsoniana, E. kybeanensis, E. obtusiflora, E. stricta, and E. vernicosa.  (Many eucs often get much larger than expected because the heights cited for them are too conservative.)
• Eucs for screening purposes: Any euc species with a prominent lignotuber can be grown as an annually coppiced screen, always making very dense regrowth after being cut back.  They can also be sheared, although it must be done frequently, and an occasional hard cutting back helps to regenerate their growth.  Species with dense crowns that keep a lot of their lower branches can also be used as very large scale screens.  The most reliable for this purpose are E. crenulata, E. stellulata and E. subcrenulata.
• Eucs for feature ornamentals: Most eucs make grand specimen trees in landscapes and parks.  Some species with the most beautiful combination of foliage, bark and form include E. coccifera, E. cordata, E. crenulata, E. dalrympleana, E. glaucescens, E. kybeanensis, E. mannifera and its subspecies, E. mitchelliana, E. morrisbyi, E. nitens, E. pauciflora and its subspecies, E. perriniana, E. rossii, E. rubida, E. rupicola, E. saxitilis, E. scoparia, E. subcrenulata, E. tenuiramis, E. triflora, E. urnigera, and E. viminalis.

CLIMATE refers to the overall climatic patterns of the region where the tree will grow.  Within any given climate is a wide range of sites.  It is important to know what species will be adapted to your climate or else it might not do well regardless of how suitable the site is.

Temperate climates vary somewhat in conditions such as timing and duration of freezes, summer temperatures and humidity, and rainfall amounts and patterns.  I have divided up these climates on a regional basis.  This is not really intended to be a complete guide, but just a general guide of what eucs have been able to grow in certain climates and which ones might be promising based on educated conjecture.

• The Pacific Northwest and Britain are two places that have reasonably similar climates to one another and where people have tried to grow eucs for a long time.  The climate is generally maritime but with warmer summers than immediate coastal fog belts.  Some have argued that Britain's climate does not experience as severe freezes as the Pacific Northwest because the cold air is moderated when it crosses the North Sea.  There is probably something to this, but I would say that, except for Britain's much milder coastal microclimates, the two regions are still reasonably comparable to each other.  E. aggregata, E. coccifera, E. glaucescens, E. gunnii, E. neglecta, E. parvula, E. pauciflora ssp. debeuzevillei, E. pauciflora ssp. niphophila, E. perriniana, E. rodwayi, E. saxitilis, E. subcrenulata, E. urnigera, and E. vernicosa are all generally well adapted in this climate, but obtaining a hardy provenance can make or break the success of a euc tree in the Pacific Northwest or Britain.
• Mediterranean climates are generally able to grow a wide range of eucs as long as it is not too cold.  Places such as Southern California, western South Africa and of course the Mediterranean are very much to the liking of most eucs.  Some of the more popular species of eucs in such regions include E. viminalis, E. globulus, E. camaldulensis, E. blakelyi, E. cinerea, E. bridgesiana, E. mannifera and its subspecies, as well as E. sideroxylon, E. leucoxylon, E. stricklandii and many other showy-flowered species.  There are also many fantastic species from northern and western Australia such as E. papuana, E. citriodora, E. diversicolor, E. macrocarpa, and E. salmonophloia that are popular landscape trees in Mediterranean climates.  Many of these species are not particularly hardy and fall outside the scope of this page.
• Very cold areas such as in USDA zones 5-6 (and colder) cannot really grow eucs reliably to a large size.  Generally, you have two options if you live in such an area and wish to grow a euc permanently in the ground (as opposed to a potted plant that can be brought indoors for the worst cold).  You can choose one of the hardiest species and find a sheltered microclimate for it, plant it in the spring and hope it makes it through a few winters - for which the best species might be E. gunnii, E. neglecta, E. lacrimans, E. parvula, E. pauciflora ssp. niphophila, and E. pauciflora ssp. debeuzevillei - or you could grow them in a perrenial border or some such thing, and plan on the tree dying back to the ground annually and regrowing in the spring.  Should you choose the latter method, any hardy species that forms a strong lignotuber (such as E. cinerea, E. nova-anglica and E. elliptica) will do.  For more information see A Discussion of Eucalyptus Cold-hardiness.
• Mild coastal climates throughout the world are generally able to grow a wide range of eucs.  These climates are characterized by a lot of rain and fog, and very few extremes of temperature.  This includes such places as sheltered coastal areas of the British Isles, the wet north coast of Spain, the immediate coast of southern Oregon and California (and sheltered points north of there), most of New Zealand (especially Fiordland), western Tasmania, and coastal Chile around Valdivia.  (A reasonably similar climate is found at many areas of very high elevation and low latitude - for example, E. globulus thrives at 10,000' in Ecuador.)  Although many species will grow in such places, some of the best ones adapted to these extreme maritime climates include E. brookeriana, E. coccifera, E. cordata, E. cypellocarpa, E. dalrympleana, E. delegatensis, E. dunnii, E. fraxinoides, E. globulus and its subspecies, E. kitsoniana, E. mitchelliana, E. morrisbyi, E. nitens, E. nitida, E. obliqua, E. olsenii, E. paliformis, E. regnans, E. sieberi, E. triflora, E. urnigera, and most of the really hardy alpine species.  (See also "Sites with salty air" above.)
• The Southeast USA and Texas (referring especially to USDA zones 7 - 8) have very hot summers and mild winters with occasional hard freezes.  It is difficult to say what species will ultimately prove successful in this region, since it is too cold in winter for most of the heat-loving tropical and desert species, and too hot in summer for many of the hardy alpine species.  I would suggest that some of the best species for this region include E. aggregata, E. alaticaulis, E. camphora, E. cinerea, E. goniocalyx, E. mannifera and its subspecies, E. neglecta, E. nicholii, E. nortonii, E. nova-anglica, E. rodwayi, and E. stellulata; and possibly also E. bridgesiana, E. cephalocarpa, E. dives, E. morrisbyi, and E. tenuiramis.  There have also been local reports of some success with E. pauciflora ssp. niphophila in Alabama and Texas, and E. parvula and E. gunnii in Alabama.  Milder areas (zone 8b - 9) should do well with E. blakelyi, E. camaldulensis, E. microtheca, E. nandewarica, and E. polyanthemos.  Much more testing of eucs in the Southeast is needed.  (Milder areas of the Eastern Seaboard - eastern North Carolina, Virginia, etc. - might try some of the species recommended for the Southeast and for the Pacific Northwest, since the climate is not quite so hot as the Southeast.)
• The New Zealand Southland, and some other locales in the Southern Hemisphere such as central Tasmania and parts of Argentina, have a climate generally favorable to most hardy eucs, but presenting a unique set of challenges.  The climate is mostly maritime in that there is plenty of rainfall and a general absence of extremes, but takes on some characteristics of a continental climate, including the interesting phenomenon of summer frosts.  Graham and Heather Milligan in the New Zealand Southland have conducted extensive trials and have found the following species to be among the best for such a climate (though many more will do reasonably well): E. camphora, E. crenulata, E. glaucescens, E. gunnii, E. gunnii ssp. archeri, E. perriniana, E. parvula, E. rodwayi, and E. stellulata.
• The Gulf Coast and Florida will probably not be able to grow many of the species covered on this page.  Most of the alpine species do not tolerate subtropical heat and steamy weather through most of the year.  Many of the Mediterranean species, as well as some of the hardier rainforest species, might eventually prove successful here.
• True desert climates will not be able to grow most of the species listed here, but do have a wide range of species to choose from.  There is a huge variety of species from hot interior areas of Australia, most of which tend to be hardy to about 15 - 20°F.
• True tropical climates will not be able to grow the species covered on this page either.  Although there are many tropical euc species, the hardy ones do not generally survive more than a couple years in climates with year-round heat.