Plants
Foam Flower
Tiarella · Saxifragaceae
Foam flower is one of the finest perennials for shade: in spring, frothy, delicate flower spikes in white to soft pink hover above prettily marked, often dark-veined foliage. As a ground cover beneath trees and shrubs, Tiarella is almost indestructible and grows denser year after year. If you want to bring a dark corner of the garden to life, there is hardly anything more rewarding.
- Light
- Partial to full shade; harsh sun scorches the foliage.
- Watering
- Keep evenly moist; established plants tolerate short dry spells.
- Care level
- Easy
- Botanical
- Tiarella
In the trade you will mainly meet two groups: the runner-forming Tiarella cordifolia, which quickly knits into closed carpets, and the clump-forming Tiarella wherryi, which politely stays put. Add to these modern hybrids such as ‚Spring Symphony‘ or ‚Pink Skyrocket‘ with deeply cut foliage and stronger flowering. Use the running types for larger areas and the clumpers for bed edges.
Its big moment is May: hundreds of tiny star-shaped florets stand on slender spikes above the foliage, looking genuinely frothy — hence the name. After flowering the leaves stay attractive, remain semi-evergreen in mild winters and often take on a lovely bronze autumn tint.
The ideal spot is partial to full shade beneath deciduous trees and shrubs, in humus-rich, evenly moist soil. What Tiarella will not tolerate is bone-dry root zones under old conifers and winter waterlogging — both are the most common reasons it sulks.
In garden design, foam flower is the perfect companion for ferns, hellebores and hostas: it fills the gaps without pushing itself forward. We also value it highly for grave planting, because it looks tidy with little care and closes the soil neatly.
A typical mistake is to treat it like a border diva and plant it in full sun — the foliage scorches and the plant stays stunted. It is at its best when given time: by the third year the carpets are dense and the flowering generous.
Is Foam Flower toxic to children and pets?
- Children
- Non-toxic
- Cats
- Non-toxic
- Dogs
- Non-toxic
Foam flower is considered non-toxic to cats, dogs and children, making it a good choice for family gardens. As with all ornamentals, eating larger amounts is still not advised.
Overview: toxic & non-toxic plants for cats, dogs and children
Care
- 01Choose a partially to fully shaded spot with humus-rich, moist soil.
- 02Water regularly in the first year until established; afterwards only during longer dry spells.
- 03Spread a little compost or leaf mould around the plants in spring — that replaces fertiliser.
- 04Cut back spent flower spikes to keep the foliage looking tidy; some varieties will rebloom.
- 05Avoid waterlogging; improve heavy soils with leaf compost before planting.
- 06Divide runner-forming varieties every few years if the centre starts to thin out.
Frequently asked
- Is foam flower hardy?
- Yes, Tiarella is fully hardy in Central Europe and survives even severe frosts without protection. In mild winters the foliage even stays largely green. Only wet, compacted soils can trouble it over winter.
- Does foam flower grow under trees?
- That is exactly where it is happiest — beneath deciduous trees and shrubs in humus-rich soil. Only the heavily rooted, dry zone right at the trunk of old conifers is difficult. There it helps to improve the soil with leaf compost and water consistently in the first year.
- Is foam flower toxic to cats or dogs?
- No, Tiarella is considered non-toxic to cats and dogs and is listed as safe in North American toxic-plant databases. That makes it a good fit for gardens where pets roam.
- When does foam flower bloom?
- The main flowering runs from April to June, peaking in May. If you cut back the spent spikes, many varieties produce scattered repeat blooms over summer. The patterned foliage stays attractive all season anyway.