Check Here Before Buying – Pot Size Matters...Not all websites offer the same. Plants in a 2-litre pot have twice the root system of a P9 or 1 litre pot.


Check Here Before Buying – Pot Size Matters...Not all websites offer the same. Plants in a 2 litre pot have twice the root system of a P9 or 1 litre pot.

Best Value Plants - Plant Pot Size Guide

The pot size you buy your plant in is critical to plant development and survival. It is very important to ensure that the plant(s) you are buying have been grown in the size of a pot that provides not just the cheapest plant but represents the best value for that particular plant. Some suppliers avoid ensuring pot size is clear at the point of purchase so their plants look inexpensive but in the long run, they can result in slower development and increased losses. Some offer plants in P9 pots which are plants often less than 1 year old, many varieties of which can be more difficult to establish straight out in the garden. Clearly, a plant in a 2 litre pot has twice the root system of one that initially may look slightly cheaper in a 1 litre pot but often offers worse value for money. Always check!

The majority of plants sold online by Jacksons Nurseries come in pots of various sizes. Most pot sizes are referred to by their volume capacity in litres, with the exception of pots that are smaller than 1 litre which is usually referred to by the diameter or cross section of the top of the pot (P9 is approximately a 9 x 9 cm pot).

The table below gives the approximate measurements of the common pot sizes we use at Jacksons Nurseries. Generally, for instance, grasses, shrubs, ferns & perennials etc are the best value in a 2 or 3 litre pot unless there is a particular cultural reason to grow in a larger pot. Sizes are only a guide as the exact measurements vary depending on pot manufacturers.

Pot Size Pot Diameter (Top) Pot Diameter (Base) Pot Height
9cm  9.0cm 3.5" 6.0cm 2.5" 8.5cm 3"
1 Litre 13.0cm 5" 10.0cm 4" 11.0cm 4"
2 Litre 17.0cm 6.5" 12cm 4.5" 13.0cm 5"
3 Litre 19.0cm 7.5" 13cm 5" 15.0cm 6"
4 Litre 20.0cm 8" 15.5cm 6" 16.5cm 6.5"
5 Litre 22.5cm 9" 16.5cm 6.5" 18.0cm 7"
7 Litre 25.0cm 10" 19.0cm 7.5" 20.0cm 8"
10 Litre 28.0cm 11" 24.0cm 9.5" 22.5cm 9"
15 Litre 33.0cm 13" 25.5cm 10" 30.0cm 12"
20 Litre 35.5cm 14" 27.5cm 11" 32.5cm 13"
25 Litre 38.5 cm 15" 30.0cm 12" 35.0cm 14"
30 Litre 41.0cm 16" 33.0cm 13" 36.0cm 14"
40 Litre 50.0cm 20" 35.5cm 14" 45.0cm 18"

So, always look out for the pot size the plant has been grown in – its critical best value for your garden and budget.

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Do you have Euphorbia amygdaloides var Robbie wood spurg in stock

@ Viv - Hi Viv - we don't stock that particular variety but we do sell a wide range of other Euphorbia plants - please see this page for our range:
This is so useful. So often growers suggest volumes and not pot sizes. Thank you so much.

@ Vicky - thanks so much Vicky, we appreciate the feedback.
Why can’t nurseries just say how tall a tree is instead of using a litre pot I don’t so much care about the litre under ground it’s so silly a conifer in a one litre pot is how tall as opposed to one in a 3 litre pot?! So irritating

@ Jimmy - thanks for your feedback. We appreciate your frustration and sometimes try to show plant heights for e.g. bare root plants and hedging. The difficulty we and other nurseries have is we grow or buy plants from suppliers by pot size and it's often difficult to reliably give an indication of height, which may vary throughout the year or depend on how long the plant has been grown on within the pot. Herbaceous perennials, for example, die back below ground each winter before bursting back into life again in the spring. Similarly, many fast growing bamboo plants in a particular pot size can put on 45cm+ of growth in a season, so their height can be very different in the same size pot depending on when they are bought over the course of the year or gardening season. That said, we take your comments on board and will try to show supplied heights as much as possible on our website going forward.
Hi I am looking to buy 2 Japanese trees in pots I don’t want big ones what do you recommend . It is for back garden which gets no sun in morning but sun in afternoon xxx

@ Sylvia - Hi Sylvia, thanks for your question. You can see our full range of Japanese maples on our website here: You can use the product filters to refine your search, for example by eventual height/spread, etc. We have also written a guide to Japanese maples that you may find useful:
@ Pasquale - we supply Golden Alder trees (Latin name Alnus incana 'Aurea') in 10-15 litre pots. These are quite mature trees with a 120-150cm stem, priced at £34.99. We also sell bare root common Alder as young trees between November and March. Please type "Alder" into the search bar at the top of our website for more details of the options available and feel free to call us on 01782 502741 if we could be of any further assistance.
How tall is an Evergreen Alder 8″ Pot and how much would cost?
what size is the plant when it is sold by the size of the pot, i.e., 1 x 3.5 litre potted XXX plant

Hi Jean, the size varies from plant to plant and the season so it's best to enquire on a particular plant(s) when you want to make a purchase.
Told me exactly what I was looking for. Thank you

@ Graham - thanks for the feedback, glad this was useful for you.
Why on Earth can’t pot manufacturers print the size of the pot on the side of it. Or I press it into the plastic?

@ Len - we think all pot manufacturers should do this. Quite often it will be pressed into the plastic underneath (you may need to clear the dirt and soil off to see it) - but we appreciate there are some manufacturers who don't always do this.
thanks for pot size guide, very useful

@ Freda - thanks for the feedback, we are glad you found the guide useful.
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