Clematis Cassandra

Clematis Cassandra
Clematis Cassandra
Clematis Cassandra
Clematis Cassandra
Clematis Cassandra

Clematis Cassandra

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(9 Reviews)
In stock
Thorncroft Clematis
Plant Size
Plants will usually be about 45-90cm tall on delivery, this can vary depending on the time of year and variety chosen. They are grown in 3 litre containers and are 2 years Old.
Sun to Part Shade
Facing Aspect
Flowering Months
July - September
Average Flower Size (Inches)
Average Height (Feet)
Hard in Feb/March (Group 3)
Soil Type
Well Drained
Hardiness Zone
H6 - Hardy - Very Cold Winter (-20C to -15C)
Suitable for Containers
RHS Award of Garden Merit
1.50 kg
Cultivation Information

The clusters of rich deep blue hyacinth shaped flowers are strongly scented. A favourite in our garden. This clump-forming clematis has erect woody stems and requires free draining soil.
Awarded the RHS Award of Garden Merit


Cultivation Advice
These fabulous, yet unusual clematis are classed as herbaceous sub-shrubs as their growth is so very different from the rest of the genus Clematis. 'Cassandra', 'Wyevale' and stans, have erect woody stems and produce clusters of hyacinth shaped flowers. 'Praecox' produces star-like flowers with recurved tips and woody scrambling stems. These make excellent plants for the border, they are easy to grow and bloom over a long period.  This group of plants flower and perform better in sunny free draining conditions.  

Leave pruning until mid-spring(April) when the weather has improved. Do NOT prune these hard in autumn or winter when tidying other herbaceous plants as the Heracleifolia Group over-winter better with the old growth left intact. Avoid them becoming too excessively wet during their first autumn and winter in the ground or perhaps plant in the spring.

Delivery Details

Delivery from £7.99 and most customers never pay over £9.99!

We offer a year-round Mail Order and Delivery service (subject to weather and availability). We do not dispatch small or young plants, but send our mature plants in 3 litre pots anywhere in the United Kingdom and Europe.

We dispatch Monday to Thursday each week so usually your order will be dispatched within 1-2 days of ordering, however during busy periods this can be expected to increase. Any significant delays will be notified by email and posted on the website. 
Orders made after midday Thursday are usually dispatched on the following Monday.
We use DHL for all our deliveries. To get the most out of the delivery service download the DHL App. Find out more here - DHL APP.

Our last dispatch before Christmas 2022
 will be 15th December - all orders placed after this will be sent in the New Year and that is to be from the 9th January onwards.

Instructions to Nursery
 - At the checkout stage you are able to add an instruction to the nursery such as, 'Please avoid March 20th - 25th' or 'Away in June'. 

Instructions to courier
 - Please give us details of a safe place where the parcel can be left (Please note - this is at the customer's risk). If no instructions to leave the parcel are given and there is no one to sign for it, then our carrier will try to deliver the following day.

Please provide your mobile number or email address and our carrier will tell you the hour your delivery will be made within and if it is not convenient you will be able to re-arrange the delivery directly with them.


UK Delivery Charges


Post Codes

Number of Plants



Standard postal area

Any not listed below



5 +



Isle of Wight

Scilly Isles

(2 Day Service)









Scottish Highlands

& Islands

Isle of Man

Channel Islands

(2 Day Service)

AB 31-38 & 40-56 


KA 27-28


PA 20-38; 41-49 & 60-78

PH 4-44 & 49-50








Export to Northern Ireland and outside the UK

We no longer offer to export to Northern Ireland or outside the United Kingdom and are sorry for any disappointment this has caused.

Click & Collect

Although we do not open on a regular basis, we are delighted to offer a Click & Collect option for you to collect your orders from our Rails End Nursery location in Worcestershire.
While we get to grips with this new offering we will have to restrict the collection day to a Friday only between 10:00 & 3PM with the hope of expanding that at a later date if we feel it is possible.

Make your online order, checkout and pay online just as if it was a delivery order but of course select Click & Collect instead of a shipping method.
Because we are predominantly a mail order business, our systems are automated and much of the terminology revolves around the kinds of terms used in mail order, so please forgive us for this.
You will receive the following automated emails after making your order.
1. Order acknowledgement. - Full details of your order.
2. Order Status Update - Pending - meaning your order is received into our order processing system
3. Order Status Update - Processing - meaning we are picking and cleaning your plants
4. Order Status Update - Dispatched - in the case of Collection orders, your plants are almost ready for you to pick up.
5. Order Status Update - Completed - your plants are ready for you to pick up on the next Friday.


You can collect from our new location at:
Rails End Nursery
Back Lane
WR11 7RG

About Our Plants

At Thorncroft the quality of our clematis plants is very important to us and we will not compromise on keeping up the high standards our customers have come to expect.

We supply plants mostly in a 3 litre container, growing on a 3 foot (1 meter) bamboo cane support, occasionally a 2 litre pot is sufficient to ensure a quality plant is produced.  Your clematis can not always be delivered in full flower, however we will aim to send you the most advanced plant for you so that you get the best display possible in the first year of our plants being in your garden.

Chelsea Chop - Also from time to time we will need to prune plants back to keep them tidy on their cane. While every effort is made to only supply plants in full leaf we may on occasions send plants that have been recently pruned or had leaves removed and will include notes to explain why this has been done.  It's known as the 'Chelsea Chop' and is commonly seen in late May and June.

Please keep in mind that some of the more specialist clematis have different habits, so these standards can vary depending on the type you are buying but it gives you a good guide on what to expect. 

From the very outset, the Thorncroft philosophy is to provide a clematis which will thrive for the customer in their garden but also to provide the expert knowledge that we have gained over the years to help advise you which clematis are the best.

We have been sending plants by mail order to customers all over the world and have build up a good knowledge of which plants perform best in various parts of the globe. We also value your experience and if would like to tell us about which clematis you grow in your country, please do, it will allow us to continue learning

Reviews (9)
Write a Review and share your opinions!
9 Reviews:

Excellent service
15 May 2024  | 

Well packaged, healthy, bushy plants, can't wait for them to start flowering.

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Clematis cassandra
27 June 2023  | 

Plant looked a little tired,but it's off and growing well now would place more orders all plants doing well that I have had delivered,well packaged..

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Excellent Service
07 June 2023  | 

Clematis arrived in perfect condition and a good size, have ordered from Thorncroft a few times now and have been delighted with all my plants Thank you

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Thanks for a brilliant service!
11 May 2023  | 

Wonderful, well rooted clematis. Arrived safely packaged & in excellent condition.

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Brilliant plant
02 May 2023  | 

Beautiful healthy large well rooted plant delivered in tip top condition.
The plant was meticulously packed and I received daily updates about delivery
Great value for the size and condition of the plant delivered. Brilliant planting and aftercare instructions.

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30 March 2023  | 

Very pleased with the excellent service. I was informed when the plant became available and on all stages of the order. The plant was well packaged and looks very healthy.

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17 October 2022  | 

Excellent quality service and excellent quality healthy plant arrived safely.


Lovely plants
24 October 2021  | 

I ordered five clematis, as you see from the photos they are beautifully packed, are big specimens and very healthy. I would recommend Thorncroft unreservedly


Scent Scent Scent!
29 July 2020  | 

Like scent got to have this one!
I can smell this over 30 yards away and it "thrives on neglect" according to Peter, and it sure does!
Cassandra is a winner.