General gardening topics

Growing Pieris Forest Flame

Last updated on March 14th, 2022

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The Pieris ‘Forest Flame’ is a very strong shrub that is able to survive the cold winter temperatures, making them perfect for gardens throughout the UK. More than that, come spring it creates a delightful display of new fresh red growth and stunning masses of white bell-shaped flowers, with a collection of colours that make it truly one of a kind.

Planting Pieris Forest Flame

How to grow Pieris ‘Forest Flame’

Plant them in dappled shade

If you are planning to grow the Pieris ‘Forest Flame’ you need to make sure that you provide them with the correct lighting, watering and planting requirements. In terms of sunlight, this plant normally lives in forested mountains so it needs dappled shade, however, it will also grow in the shade where many other shrubs simply won’t thrive.

Too much exposure to strong sunlight cannot only damage the new growth but turn the leaves yellow. Strong sunlight exposure will also prevent flowering and reduce the strength of the different colours. For this reason, you absolutely want to pick an area with dappled shade. 

Where to buy Pieris

Pieris Forest Flame - Large Plant in a 1litre Pot Ready to Plant - Evergreen Garden Shrub
  • STRONG plant in a 1litre pot for under £10 !!!!!
  • Provides a burst of striking read leaves in Spring - These mature to Pink and then green
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  • Can gow in a shaded area of the garden and can be grown in patio pots or garden borders
[x3] Pieris Japonica 'Forest Flame' | Multi-Pack | Evergreen Shrubs | Pot Plants
  • Pieris Japonica 'Forest Flame' is a handsome and trusted evergreen shrub of bushy, compact and upright habit. It is a large but slow growing plant perfect for borders and containers and achieves a height and spread of around 200cm x 150cm in 15-20 years. The most popular and well known Pieris.
  • Planted for interest in both its flowers and foliage, this award winning shrub displays racemes of small, urn-like, pure white flowers in Spring above glossy, oblong to lance-shaped, deep green, red foliage. New growth emerges in stunning displays of fiery red.
  • Suitable for moist but well drained acidic soil. This is a hardy plant withstanding cold Winter conditions of -15 to -10 degrees celsius. Suitable for most of the UK even in a severe Winter except for the most exposed sites. This variety is best positioned in full sun to part shade. This superb shrub has received the RHS Award of Garden Merit (AGM).
  • Please view Product Description below for summary of plant specifics and care guidelines.
  • Please note images are of mature plants for illustration purposes. Any pictured pots or surrounds not included. All plants are fully rooted, ready to plant and a suitable and healthy size for pot size advertised. We supply an identification label for each variety purchased. Please view our Amazon Store 'GrowOn Shrubs' for all our plants.

Remove Faded Flowers to Promote Growth

In terms of maintenance, you can deadhead them by removing the faded flowers so that your plant is able to put its energy into new fresh growth rather than the seed heads. Like your body, your plants have a limited amount of energy and that energy will be allocated to the next step in the process of development. If you don’t deadhead, much-needed energy will go towards making those seed heads and unless you are going to save the seeds, it is better for your plants to put that energy into developing newer, fresher growth.

Plant in Acidic Soil or Ericaceous Compost and Mulch

In order to keep the soil acidic, conserve moisture and prevent weeds from growing you should mulch with compost at least 45cm away from the base of the plant, and around the entire perimeter of the plant. Adding fertiliser regularly will also help balance out any nutrient deficiencies that might be in your soil, especially as the plant gets older. 

This type of plant requires heavily acidic soil to thrive. That means if you have alkaline soil you will have to consider growing it in a pot or container with ericaceous compost.

Plant in acidic soil or ericaceous compost if grown in pots

When you think about planting you need to make sure first and foremost that you have the right soil. This plant requires acidic soil and will grow very poorly in any other soil type. If you have highly alkaline soil (something you can test with an at-home soil kit) you will need to consider growing it in a pot or container with acidic compost, which is sold at garden centres as ericaceous compost. If you have neutral soil you can increase the acidity by mulching annually and digging in some acidic compost but this is something you will have to do every single year to keep the soil pH levels at the appropriate amount. 

Planting Pieris

When you are ready, you should dig a hole that is as deep as the container or pot in which your plant arrived. Place the plant inside the hole and fill in the remaining area with ericaceous compost and soil mixture. Then keep it well watered until it has established itself and is starting to produce new growth. Never plant them deeper than they were in the pot. If you are planting into a pot, use soil-based ericaceous compost such as John Innes.

Planting Pieris in Containers

There are dwarf, compact varieties of Pieris that do very well in containers, although most can be grown successfully in pots. If you are going to grow them in containers or pots you should choose one that is slightly bigger than the pot in which your plant originally arrived. In order to help encourage drainage and prevent the drainage holes from getting blocked, you can add pieces of broken terracotta or stone into the container and add a liquid fertiliser every spring. Plants that are grown in pots are susceptible to drying out so you might have to water them slightly more than you would water a plant grown in the ground.

If you have cultivated your Forest Flame in a container you will need to repot it every few years as it gets bigger. Again, just pick a container that is slightly larger than the root ball of the plant you have currently and then grow it on using fresh compost.

Propagating Pieris from Cuttings and Seed

Propagating pieris from seed or by taking softwood cutting

Propagating from Seed

When it comes to propagating, there are two methods available to you. The first is propagating with seed and to do this well you want to collect the seeds in the spring. You should be able to tell whether any of the seeds are viable by soaking them in water for at least 24 hours. Do not use any seeds that float to the top. 

  • Taking the remaining seeds, fill each pot to approximately 4cm from the top, pat the mixture down and place one seed in every pot.
  • The seeds should be placed directly on top of the soil with a thin layer of compost scattered on top so that light is able to penetrate. 
  • You should mist with water and then cover it with some form of plastic bag or plastic container.
  • Place all of your pots in an unheated greenhouse sheltered from any direct sunlight, or a similar suitable place. 
  • If they become dry you should mist them being careful not to overwater them.
  • Within approximately one month you should have seedlings with several sets of leaves, in which case you can move your plants to containers for growing on.

Taking Cuttings

The other option for propagation is to propagate from softwood cuttings. This is something you should also do in the spring and directly after flowering. It is best to water the plant very well a few days prior to taking your cuttings.

  • Prepare the pots with a mixture of 1/2 compost and 1/2 perlite.
  • Select stems approximately 15cm in length from the top of a healthy branch. You want stems that are flexible and have young leaves on them but don’t have any flowers. Using a sharp set of clean pruning shears or a knife, cut them off at a 45-degree angle.
  • Remove the leaves from the lower part of the stem, leaving one set on top and dip the other end of the cutting into a rooting hormone powder to help establish roots effectively.
  • Place each cutting directly in the centre of the pot and firmly pack the soil around them.
  • Mist each plant and cover them securely with plastic in the form of a plastic bag or plastic lid, making sure the plastic does not touch the leaves directly.
  • Place the cuttings in an unheated greenhouse shelter from direct sun.
  • In approximately 8 or 10 weeks you will notice new growth taking place, you might even see the roots coming out of the bottom drainage holes, in which case you can remove your plants and repot them elsewhere.

Feeding and Watering

When you first plant your Pieris, you will need to regularly water it until it establishes itself. Like many plants, once it becomes established you will only have to water during prolonged dry spells, particularly in the summer months. This plant, like many others, does not enjoy being waterlogged so you never want it to sit for a prolonged amount of time in the water.

Watering and feeding pieris forest flame

In terms of feeding the importance of acidic soil has already been covered and to that end, if you have naturally neutral soil and are using the well-rotted pine needles to help compensate for the pH levels, you can give a dose of fertiliser for acid-loving plants in the spring as well.

If you already have acidic soil and you aren’t compensating, you should consider adding well-rotted pine needles as part of the mulch on an annual basis anyway because it really does help to give nutrient value to your plants. If at any time you notice the leaves are turning yellow it is typically a sign of nutrient deficiency, at which point you can add another dose of acid or ericaceous fertiliser.


Pieris plants don’t require a great deal of pruning. It is very slow-growing, so at most, you should deadhead and remove any dead or broken branches. If you are going to prune to improve the shape or maintain a specific size, you should do it immediately after flowering. If you don’t and you prune too late, you may not get flowers the following season.

If you choose to prune for size or shape and you do it during the summer or autumn, rest assured you won’t harm the plant but you simply won’t get as many flowers. In a few years, the flowers will come back just as strong. If you want to encourage newer developments, newer growth, you can always cut back some of your longer branches in half to encourage a second flush of growth but this as well will sacrifice the flowers you get on those branches the following spring. If you can, always remember to prune straight away after flowering.

Last update on 2024-06-12 / Affiliate links / Images from Amazon Product Advertising API

Welcome to my site, my name is John and I have been lucky enough to work in horticultural nurseries for over 15 years in the UK. As the founder and editor as well as researcher, I have a City & Guilds Horticultural Qualifications which I proudly display on our About us page. I now work full time on this website where I review the very best gardening products and tools and write reliable gardening guides. Behind this site is an actual real person who has worked and has experience with the types of products we review as well as years of knowledge on the topics we cover from actual experience. You can reach out to me at

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