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Syringa vulgaris 'Souvenir de Louis Spaeth' Tree

'Souvenir de Louis Spaeth' Lilac Tree
  • From £44.99 (ex VAT)

Syringa vulgaris 'Souvenir de Louis Spaeth' produces a profusion of highly fragrant purple flowers in long panicles. The flowers attract pollinators and stand out well against the backdrop of heart-shaped, mid-green deciduous foliage.

A lovely Purple Lilac tree, Souvenir de Louis Spaeth' can grow into a large bush that is 3.5 metres in height and spread over 20 years. Doing well in full sun or partial shade, Lilac 'Souvenir de Louis Spaeth' prefers a well-drained soil with a neutral to alkaline acidity.

This Lilac variety has received the RHS AGM and is valued for it's reliable, richly coloured flowers in panicles up to 30cm long.

AKA Syringa vulgaris 'Andenken an Ludwig Späth', Lilac 'Souvenir de Louis Spaeth', Purple lilac tree

  • Common name: 'Souvenir de Louis Spaeth' lilac tree
  • Height and spread in 20 years: 3.5 x 3.5 metres
  • Seasons of interest: Spring, Summer
  • Environmental benefits: Good for pollinators
  • Foliage: Mid-green, heart-shaped leaves in spring and summer
  • Flowers: Fragrant, purple flowers in long panicles
  • Soil: Prefers a well-drained site with neutral to alkaline soil acidity

Planting Advice for Syringa vulgaris 'Souvenir de Louis Spaeth' Trees

Our pot grown Souvenir de Louis Spaeth Lilac trees can be planted at any time of the year. Start by removing weeds and grass within a metre of your desired planting hole. Dig a square hole as deep as your root mass and approximately 2x as wide. To help the tree establish more effectively, sprinkle root grow in the hole.

Remove the pot, gently tease the roots and place into the planting hole. Mix 50% of the original soil with 50% compost, fill in the hole and firm around gently. Avoid banking the soil up around the collar of the tree. Whilst bush forms of Souvenir de Louis Spaeth do not require a stake and tie support, single stem tree forms do.

Aftercare Advice for Syringa 'Souvenir de Louis Spaeth' Trees

If you’re planting in spring or summer, water well for the first few months. Increase watering if there are extended periods of hot or dry weather. If planting in autumn, you may only need to water a little. Irrigation kits make it easier.

Once planted, keep the area free of competing weeds and grass for the first couple of growing seasons.

Pruning Syringa vulgaris 'Souvenir de Louis Spaeth' Trees

Pruning is encouraged when it comes to Souvenir de Louis Spaeth Lilac trees. If you wish to maintain a bush rather than a tree, allow the side growth to flourish and simply prune after flowering. For a tree effect, prune the longest, oldest branches that lie closest to the ground.

If your Souvenir de Louis Spaeth Lilac begins to look overcrowded, remove inner branches to allow more light and air inside the canopy. Always prune dead flowers and damaged or diseased branches.

Mature Lilac trees that have become overgrown can be hard pruned back to their former glory, but it will take time. Never prune a lilac tree back by more than a third of its size. Do this one season at a time, allowing the tree to recover in between. Apply a fertiliser each autumn and again in spring, just before flowering.

Delivery Costs

1 small tree (most under 1.5 metres in height) : £9.95 + vat

1 medium tree (most 1.5-2 metres in height) or 2-4 small trees: £11.95 + vat

2+ medium trees or 5+ small trees: £14.95 + vat

1-4 trees delivered by pallet to kerbside (inc. mature Japanese Maples): 24.95 + vat

Mature trees, pleached trees or orders too large for pallet: Cost is calculated in the checkout process and varies by postcode not quantity. Starts from £48 + vat.

The above prices exclude the Scottish Highlands, where delivery starts from £24.95 + vat and is calculated in the checkout process. Please note, we are unable to deliver outside of Mainland UK.

Delivery Timescales

All trees are carefully packed by our experienced team and most are delivered within 3 weeks of placing the order, unless stated otherwise. There's no need to be in to receive your order and you can request where it is left via the checkout.

For pleached and mature trees (trees over 2.5m in height), we group orders together by geographic area for specialist delivery - we will contact these customers about the delivery date.

Trees on pre-order are still growing and an estimate of when they will be ready is on the product/basket page. Orders are despatched once all trees are ready.

Gift trees and those required by a specific date can be accommodated with pleasure, although we accept no legal responsibility for late deliveries.

To collect trees, please book an appointment. Delivery charges will be refunded.

The product table at the bottom of the page gives the forms and sizes available for this variety. Please note, photos are a guideline as all plants are unique. *Pot sizes may vary. Below are definitions of terms:

Supplied Size: Height measured from the top of the pot.

Single Stem / Pruned and shaped: Classic shaped tree with a single stem that has had pruning to help create a beautiful, natural shape.

Top grafted: A height noted next to this form refers to the length of clear stem, which will not grow taller. Only the head of branches will develop. Top grafted trees do not require complicated pruning and are ideal for small spaces.

Feathered: A feathered tree has branches from the bottom of the trunk all the way up. These branches can be removed if a clear stem is required.

Multi Stem: A multi stem tree has two or more stems arising from or near ground level, growing from one root system.

Bush: A plant with many stems low down, rather than one clear stem.

Clump: Several plants in one pot that can give the appearance of a multi stemmed and very bushy tree.

Climber: A plant that is a natural climber and will be delivered usually running up a bamboo cane, ready to position in the garden.

Standard Tree: A more mature tree with an upright clear stem of approximately 1.8m-2.0m (measured from the soil to the lowest branches of the crown). Standards are available in different forms relating to their girth size (circumference of the stem measured 1m above soil level), not height:

Standard  either 6-10cm or 8-10cm girth, approximately 2.5-3.0m in height
Premium Standard  10-12cm girth, approximately 3.0-3.5m in height
Heavy Standard  12-14cm girth, approximately 3.5-4.5m in height
Extra Heavy Standard 14-16cm girth approximately 4.0-6m in height

Plant Specification Form Supplied Size Root typePrice Quantity Qty
Syringa vulgaris 'Souvenir de Louis Spaeth' Form: Bush Supplied Size: 60-90cm Root type: 10L pot* Syringa vulgaris 'Souvenir de Louis Spaeth' Price £44.99 (ex VAT)
Bush 60-90cm 10L pot* £44.99 (ex VAT)
Syringa vulgaris 'Souvenir de Louis Spaeth' Form: Standard Tree, 8-10cm girth Supplied Size: approx 2.5-3.0m Root type: 28L pot* Syringa vulgaris 'Souvenir de Louis Spaeth' Price £209.99 (ex VAT)
Standard Tree, 8-10cm girth approx 2.5-3.0m 28L pot* £209.99 (ex VAT)
Total: £0.00 (VAT Free)