Gadenin日本語Get the appSorting out the genus
Plants sold as silverberry, oleaster, goumi and autumn olive all belong to Elaeagnus, and they share the family traits: scaly silver or brown dusting on leaf undersides, small scented tubular flowers, and roots that fix nitrogen through Frankia nodules. Beyond that they differ enough that mistaking one for another will lead you to prune at the wrong time, expect fruit in the wrong season, or plant something you should not.
Goumi itself is Elaeagnus multiflora: deciduous, six to eight feet (1.8 to 2.4 m), flowering in mid spring and ripening its oblong red berries in early summer. That summer ripening is the key identifier. If your plant fruits in autumn, you have something else.
| Plant | Habit and season | Fruit | Points to note |
|---|---|---|---|
| Goumi (Elaeagnus multiflora) | Deciduous shrub, flowers mid spring, ripens early summer | Oblong, red with silver flecks, on long thin stalks | The best fruit of the group; the plant this guide describes |
| Autumn olive (E. umbellata) | Deciduous, larger, ripens in autumn | Small, round, red, speckled | Widely invasive in parts of North America; avoid planting |
| Russian olive (E. angustifolia) | Small tree, very silver, ripens autumn | Dry, mealy, yellowish | Invasive across much of western North America; restricted in places |
| Silverthorn (E. pungens and hybrids) | Evergreen, flowers autumn, ripens spring | Small red, edible but sharp | Grown as hedging and for scent, not for a crop |
| Seedling-grown goumi | As goumi, but variable | Smaller, seedier, often more astringent | Fine as a pollination partner or nitrogen plant |
| Selected large-fruited goumi | As goumi, more upright | Noticeably larger, sweeter, less astringent | Sold as named clones; worth paying for as the main bush |
Seedlings versus selected plants
Goumi grown from seed is genetically variable, and the variation shows up exactly where it hurts: berry size, seed proportion and how astringent the fruit remains at full ripeness. A seedling bush can be excellent or it can be a plant whose fruit never quite becomes pleasant to eat fresh, and you will not know which for three or four years.
Selected plants are propagated from cuttings or layers of an individual that was chosen for larger, sweeter fruit, so they perform predictably. The sensible arrangement in a small garden is one selected plant for eating and one cheaper seedling or sucker-grown plant nearby as its pollination partner. The partner's own fruit will still be usable for cooking, and the cross-pollination lifts the crop on both.
If you already have a seedling that fruits poorly, do not write off the site. Layer or take cuttings from a better plant, grow it alongside, and judge again once the two are flowering together; some of what looks like poor quality is really poor pollination.
Choosing on the basis of how it behaves, not how it looks
Two practical differences matter more than fruit flavor when you are deciding what to put in the ground. The first is thorniness: goumi carries short spurs that sharpen with age on some plants and stay soft on others, and a thorny plant is markedly less pleasant to pick over five separate passes. Feel a shoot before you buy.
The second is suckering vigor. Some plants stay as a tidy clump; others run and put up shoots several feet out. In a hedge or a nitrogen-fixing understorey that is a feature. Around a lawn or a border it is an annual chore. Ask, or watch a young plant's second summer before you decide where the third one goes.
- Check the leaf underside Turn a leaf over. Dense silvery scales with scattered brown ones is Elaeagnus. If the underside is plain green, whatever you have been sold is not in this genus at all.
- Ask when it flowers Spring flowering with early summer fruit is goumi. Autumn flowering with spring fruit means an evergreen silverthorn type, which is a hedging plant rather than a fruit bush.
- Feel the shoots for spurs Run a hand carefully down a two-year shoot. Sharp woody spurs mean a plant you will not enjoy picking; a smooth shoot is worth choosing over a slightly better-fruited thorny one.
- Confirm it is not autumn olive Round fruit ripening in autumn on a large vigorous shrub is E. umbellata. Do not plant it, and check local restrictions before planting any Elaeagnus near wild ground.
- Buy the second plant at the same time Cross-pollination raises the crop far more than any difference between selections. One good plant plus one ordinary one beats a single excellent plant on its own.
Nursery labeling in this genus is unreliable and goumi is regularly sold under the names of its relatives. The flowering and ripening seasons are the only identification you can trust without waiting for fruit.
Writing down what you have
Record the name each plant was sold under, the date it went in and its exact position, then add what you actually observe in its first fruiting year: ripening season, berry size, how astringent it stayed, and whether the shoots developed spurs. Labels fade and fall off within a few seasons, and this is the record that replaces them.
When you propagate later, that same note tells you which plant in the row is the one worth taking cuttings from. Without it you are choosing at random among plants that look, in winter, almost identical.