Two plants that almost nobody plants on purpose, and that many people scrape off, carry one of the greatest habitat values you can hang on a house wall: ivy and Virginia creeper. One flowers long after summer is over and then feeds the birds through the whole winter. The other turns a bare facade red in October and holds more life than you would ever guess from below. Both carry a stubborn bad reputation: they supposedly destroy the masonry. That is not how it works, and this article shows you where the myth comes from and how to use both climbers as habitat instead of fighting them.
Why ivy is the most important late nectar source in the garden
In high summer the table is richly set: linden, clover, sunflower, plenty of perennials. From mid September onward it thins out. The ivy bloom falls exactly into that gap. From roughly CW 37 to CW 43, that is early September to late October, ivy opens its unassuming green-yellow umbels. To us they look like nothing. To insects they are one last big feast before winter.
On a sunny October day a flowering ivy wall practically hums. Honeybees stock up on the last winter provisions, wasps, hoverflies and bumblebees join in, and with a bit of luck you spot the ivy bee (Colletes hederae), a solitary bee that flies only a few weeks a year, precisely when ivy blooms. Without ivy, this species would not exist here.
The catch: ivy does not flower straight away. When young it climbs upward with lobed leaves and clinging roots, the familiar juvenile form. Only once it has reached the top and gets enough light, roughly from its tenth year, does it form the adult growth: rounded leaves, bushy shoots that stand out from the surface, and finally flowers. Anyone who cuts ivy back hard every year prevents exactly this adult form, and with it the flowers and berries. Here, patience literally pays out in life.
Winter berries: food when nothing else is left
Over winter, the autumn flowers turn into berries. And here lies the second great value: ivy berries ripen extremely late. They only turn truly soft and blue-black in February and March, exactly when the stores of rose hips, sloes and rowan berries have long been eaten bare. Blackbird, blackcap, starling, thrush and robin then find in ivy one of the last reliable food sources before the breeding season.
A dense, old ivy is also an excellent winter shelter. The evergreen canopy of leaves keeps off rain and wind, birds roost in it protected, insects overwinter in the crevices, and in spring blackbird and wren happily nest in the thick tangle. A single large ivy on a wall thus does more for birds than three fat balls, and all without any effort from you. If you like to feed birds anyway, ivy fits perfectly alongside it; how to combine the two sensibly is covered in our article Feeding birds year-round and supporting them naturally.
Virginia creeper: the red wall in October
Virginia creeper is the fast sibling for anyone who does not want to wait a decade. The name covers two closely related species: Boston ivy (Parthenocissus tricuspidata), which clings smooth and flat against the wall, and five-leaved Virginia creeper (Parthenocissus quinquefolia), which grows more loosely and likes to ramble over fences and pergolas. Both put on one to two metres a year and turn a red in October that outshines every other autumn colour in the garden.
Its ecological value lies less in the flower, which is small and green, than in the structure. A green wall is a vertical biotope: birds nest in the dense foliage, spiders and insects live between the leaves, and in autumn the small blue-black berries are much sought after by blackbird and starling. On top of that comes the benefit for you: a green wall cools noticeably in summer, dampens street noise and protects the render from driving rain and UV.
Unlike ivy, Virginia creeper needs no climbing aid on a smooth wall. Boston ivy forms small adhesive pads on its tendrils, plate-shaped cushions that stick to almost any surface. They do not bore, they only stick. On a rough pergola or a wire, the five-leaved species climbs with tendrils, entirely without adhesive pads, and can be taken off the wall completely in winter.
The wall-damage myth, calmly sorted out
Now to the most stubborn prejudice. The blanket claim that "ivy and Virginia creeper destroy the wall" is wrong, but it has a kernel of truth. It depends on which plant, which surface and in what condition.
Virginia creeper climbs with adhesive pads. These pads stick to the surface, they do not penetrate. On intact render, clean joints and sound masonry, Virginia creeper leaves no damage. What remains when you tear it off are small sticking points that can be painted over. It only becomes critical on already damaged spots: crumbling old render, open cracks, loose shingles. There the plant can grow into existing gaps and enlarge the damage. The plant does not cause it, it uses it.
Ivy is the more serious case, but here too distinction matters. Ivy climbs with clinging roots, short root clusters along the shoots. These roots take no water and no nutrients from the wall; they are purely holding organs and do not penetrate a smooth, intact wall. But ivy grows old, heavy and thick, and it grows into every crevice it finds. An open mortar joint, a crack in the render, a gap under the edge of a roof tile: there it grows in, thickens and can eventually force it apart. On timber framing, under gutters and on old shingle facades, caution is called for.
Check the wall honestly
Before you plant, look at the facade closely. Is the render intact, are the joints tight, is the gutter firmly fixed? On a healthy wall, greening is harmless. With loose render, cracks or timber framing, leave it, or choose Virginia creeper on a trellis set away from the wall.
Choose the right plant
If you want quick green and autumn red, take Virginia creeper. If you want flowers, winter berries and a bird shelter, take ivy, but plan for the decade until it flowers. On delicate facades always use the rambling five-leaved Virginia creeper on a support, never the self-climber directly on the wall.
Set the limits early
Both grow vigorously. Keep the gutter, windows, roller-shutter boxes and the boundary to your neighbour clear from the start. A cut twice a year, in spring around CW 10 and after the berries ripen, keeps the plant in shape without sacrificing the bloom.
Spare the animals when you prune
Never cut deep into the tangle during the nesting season from March to August. Autumn after the berries ripen, or late spring, are the right windows. That way you disturb no nests and leave the birds their winter berries.
Combining ivy and Virginia creeper in the wildlife garden
The two work best together when you give them different jobs. Let ivy take the shady north wall, the old tree stump or the dry-stone wall, where nothing else grows. Give Virginia creeper the sunny wall or the pergola, where its autumn red comes into its own. That way you close several nectar gaps at once across the year: the Virginia creeper carries berries in early autumn, the ivy flowers afterwards and pushes its berries into late winter. How to fill such gaps systematically is shown in the article A bee pasture all year: closing the nectar gap.
- Late nectar
Ivy flowers in September and October, when almost nothing else offers nectar. The ivy bee depends on it completely.
- Winter berries
Ivy berries ripen only in February and March and feed blackbird and thrush in the hardest time before breeding.
- Bird shelter
The evergreen, dense tangle offers a roost, wind protection and a nesting site, on wall, tree and fence.
- Facade cooling
Virginia creeper dampens summer heat at the wall by several degrees and protects the render from driving rain and UV.
You do not plant ivy for yourself, but for the grandchildren and the birds.
Old gardener's rule
Frequently asked questions
Häufige Fragen
Does ivy really destroy a house wall?
On an intact, smooth wall with tight joints, ivy does no damage. Its clinging roots take up no water and do not penetrate sound masonry. It only becomes dangerous on already damaged spots: open mortar joints, cracks in the render, loose roof tiles or timber framing. There it grows into existing gaps, thickens and can eventually force them apart. Check the wall honestly before planting; on delicate facades, rather use Virginia creeper on a trellis set away from the wall.
When does ivy flower and why so late?
Ivy flowers in September and October, that is from about CW 37 to CW 43. But it only flowers once it is old enough, usually from around ten years, and only on the mature shoots of the adult form with the rounded leaves. Anyone who cuts ivy back hard every year prevents exactly this adult form and never gets flowers or berries. Let it mature at the top and cut only the edges that get in the way.
Are ivy berries poisonous?
Yes. Ivy berries contain saponins and falcarinol and are poisonous to humans. Even a few berries can trigger nausea, vomiting and circulatory trouble in children. The leaves and the sap are poisonous too and can irritate the skin. For birds, on the other hand, the ripe berries in late winter are an important food; they handle them without trouble. So plant ivy with care if small children play in the garden, and wear gloves when cutting.
Does Virginia creeper damage the render when I want to tear it off again?
Virginia creeper climbs with adhesive pads that only stick to the surface and do not penetrate the wall. If you tear it off, small sticking points remain that can be painted over. The render itself takes no damage on an intact wall. If you want to be able to keep the wall fully clear, choose the rambling five-leaved Virginia creeper on a wire or lattice; it can be taken off completely in winter without leaving a trace.
When may I prune ivy and Virginia creeper?
Do not cut during the bird nesting season from March to August, because blackbird, wren and others nest in the dense tangle. The right windows are autumn after the berries ripen and late spring, around CW 10, before breeding begins. On ivy you should leave the flowering, berry-bearing adult form at the top and cut free only the edges, windows and gutter. A shaping cut twice a year is quite enough.
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