Skip to content

Hypericum grandiflorum (Large-flowered St John's-wort)

Bog Plant
Availability:
in stock, ready to be shipped
Availability:
in stock, ready to be shipped
Availability:
in stock, ready to be shipped
Availability:
in stock, ready to be shipped
Availability:
in stock, ready to be shipped
Availability:
in stock, ready to be shipped
Availability:
in stock, ready to be shipped
Availability:
Out of stock
Availability:
in stock, ready to be shipped
Availability:
Out of stock
Availability:
Out of stock
Availability:
Out of stock
Original price £0.00 - Original price £0.00
Original price £0.00
£24.00
£2.60 - £55.58
Current price £24.00
Package Quantity: 1
Size: 2x Pot & Compost
Size Information

You can choose plants in various pot sizes. Non-potted plants arrive bare root for you to pot in the specified pot size.

Seasonal Information

Depending on the time of year, pond plants may be supplied fully-leaved, with flowers, or with foliage trimmed back.

Delivery Information

This plant is grown in the UK and sent directly from our tried, tested and trusted plant partner. Delivery price calculated at checkout.

Description of Hypericum grandiflorum (Large-flowered St John's-wort)

Hypericum grandiflorum is a large-flowered St John’s wort grown for yellow blooms and tidy foliage. It’s a useful plant for damp ground that is not permanently flooded. In a bog garden, it fits best on the higher, slightly drier areas.

Appearance

It forms a low shrub-like clump with narrow leaves and bright yellow flowers in summer. Flowers are open and flat with prominent stamens. In good conditions it can sit around 60 to 90cm tall and wide, with a long flowering run.

Care Guide

It likes light, air, and steady moisture. Soggy crowns can cause problems, so place it where water drains slowly rather than sits deep.

  • Sun: Full sun to part shade.
  • Soil: Moist, reasonably fertile soil that doesn’t stay stagnant.
  • Water: Damp soil suits it. Water in dry spells on the upper bog edge.
  • Pruning: Cut back lightly in spring to keep it compact.
  • Feeding: A spring mulch of compost supports flowering.

If stems get leggy, a harder spring cut encourages fresh shoots from lower down.

Suitability for Bog Garden

This works in bog gardens as a bridge plant between wet and normal borders. Use it on the upper edge where soil stays moist but not waterlogged.

It pairs well with rushes and irises because the flower shape is simple and the foliage stays neat. In smaller beds, keep it away from the wettest centre so the crown doesn’t sit in deep saturated compost all year.

FAQs

What is the difference between bog plants and marginal pond plants?

Bog plants prefer consistently damp or wet soil but generally do not want to remain submerged in standing water. Marginal pond plants are adapted to grow at the pond edge with their roots or crowns in shallow water. If an area stays flooded for long periods, marginal plants are usually more appropriate.

Do bog plants need to be planted in water?

No. Bog plants need reliably moist or wet soil rather than permanent standing water. They are suitable for bog gardens, damp borders and moist areas around ponds, but most should not be planted underwater.

How do I make a bog garden for bog plants?

Choose an area where the soil can be kept consistently moist and improve it with plenty of organic matter. A purpose-built bog garden can also be created by using a liner that retains moisture while still allowing some drainage, then filling the area with suitable soil before planting.

Can bog plants grow in shade?

Some can. Many bog plants grow best in sun, but there are species that tolerate partial shade. The important factor is maintaining the moist soil conditions the particular plant requires, so check the individual plant's light requirements before choosing its position.

What are the best bog plants for wildlife?

Flowering bog plants can provide nectar and pollen for insects, while dense foliage creates shelter around a pond or damp garden. A mixture of flowering periods, heights and foliage types generally provides more varied habitat than relying on a single species.

What are the best pond plants for a wildlife pond?

The best wildlife pond plants provide a mixture of underwater cover, surface shade, flowering habitat and places for aquatic insects to emerge. A balanced pond can include oxygenating plants, marginal plants and floating-leaved plants such as water lilies. Native species are particularly useful for supporting UK pond wildlife.