How to grow autumn sown sweet peas

Autumn sown sweet peas from Easton Walled GardensWhy should I grow autumn sown sweet peas?

Hardy annuals, like sweet peas, will grow, flower and die in one year. By sowing in the Autumn instead of the Spring you give the plant 6 months of extra growth. By next summer they are able to sustain bigger, earlier flowers on strong stems.

You also have two seasons to sow (Autumn and Spring) to guarantee success and a longer flowering period. Flowering dates vary from year to year so a succession of sweet peas is particularly important if you plan to have your own beautiful flowers for a wedding or family celebration.

Is it more complicated than sowing in the Spring?

Yes and No.

Yes, you will have to care for your plants over winter.

No, you will have virtually indestructible plants by the time they go out into the  soil.

Ok, so you have sort of convinced me, how do I go about it?

You will need the following:

Deep pots such as roottrainers or long tom pots and some multi-purpose compost with a slow release fertiliser added (that’s included in almost all commercial composts).

A place to put your sweet peas where they will get plenty of cold but won’t be as exposed as if they were in the open garden. A porch, cold frame or unheated greenhouse is ideal.

Anything else?

Seeds obviously (which you can buy from us here). The other thing to consider is mice. They LOVE sweet peas when they are seeds or very small seedlings. Protect your pots so mice can’t get access to the seed. That could be anything from a platform with legs that are tucked underneath so the mice can’t make it past the overhang or a clear lid to cover your sweet peas (Roottrainers supply these with the pots)

Keep an eye out for slugs too by checking the base of your pots (where they love to lurk) and removing them.

When should I sow my seeds?

You can sow anytime from early October to mid November when the days allow for a long gentle germination. Push them gently into the damp but not wet compost until they are covered by about 2cms of soil.

How do I know if I am getting it right?

What you are aiming for is lots of roots and the minimum of top growth. If you see green shoots emerging slowly and gradually putting on leaves over a period of about 3 weeks you have got it right. If your plants are turning into a jungle of green you have got them too warm and they need to go somewhere cooler to slow their growth for a bit.

But how cold is too cold?

Sweet peas can withstand temperatures of about -5 at night but will not like to be frozen in their pots all day. If you overdo it and lose the top growth, chances are, if you give them some warmth they will have established enough root to sprout again.

I’ve completely overdone it and my plants look like triffids, what should I do?

Pinch out the main stem back to 2 sets of leaves with your finger and thumb to reduce the top growth and send your plants to the sin bin as detailed above. If you have had them on a windowsill or similar, be careful not to abandon them to the cold too fast. They will need hardening off. Put them outside in the day time and bring in at night for a week before leaving them out full time.

It’s Spring! My plants are busting to go out, when should I put them in the ground?

This depends a lot on where you live but once the worst frosts are over is a good time. For us in Lincolnshire this is from Mid-March onwards. A good test is to put your hand on the ground every few days and you will gradually start to feel the soil is no longer arctic. Keep an eye out for weed seedlings appearing, this is a good indicator that your plants will also put on growth in the ground.

I still have more questions, can you help?

As well as seed and roottrainers we sell Roger Parsons excellent book on Sweet Peas in our online shop. If you need help with individual problems you can send us a tweet @ewgardens.



In pictures: Six stunning sweet peas

With two weeks to go until Sweet Pea Week, here are six of our favourite varieties of Lathyrus odoratus that will soon be putting on a dazzling display for visitors, alongside 79 others!

Click on each photo to find the seeds in our online shop, or choose from more than 30 different varieties during your next visit – nothing beats the scent or sight of seeing sweet peas in real life.

Linda CaroleLinda Carole: A new variety of sweet pea with beautiful pink striped white flowers. Just one of the record 85 varieties on show this year.

Sweet Pea Fire and IceFire and Ice: A delicate, highly scented bi-coloured variety. Enjoy its purple and cream flowers before indulging in a cream tea from our famous tea room.

Our HarryOur Harry: A wonderful annual with clear, blue flowers and a good scent that grows well against a sunny garden wall. We’ll have plenty of advice for growing your own stunning sweet peas between 29 June – 6 July.

Screen Shot 2014-06-16 at 14.51.35Henry Thomas: A striking new annual variety with deep red flowers that has fast become one of our favourite varieties. It will soon be flowering in The Pickery, inside Easton’s 400-year-old grounds.

CometComet: A rare annual with delightful cream and pink-striped flowers which are similar in colour to the exclusive David Austin’s roses we have growing here in the Rose Meadow.

Mrs CollierMrs Collier: An elegant classic with a strong scent, this was one of the first varieties to be displayed here after Ursula Cholmeley began restoring Easton 13 years ago.

Sweet Peas – six of the best

Six of the Best.

Our favourite sweet peas (this week anyway)

Linda Carole 2012

Lathyrus odoratus  ‘Linda Carole’  launched by Derek Heathcote who has produced some fine varieties since he started his business in 1992. This striking flower is similar to ‘Mars’ but seems to come better from seed. It has a carmine stripe and a delicate line outlining the white background (called a ‘picotee’ in sweet pea speak). Very good scent for a new variety.


Lathyrus odoratus ‘Matucana’ an old fashioned variety that has been around for 100s of years. The flower is smaller than the modern varieties but what it lacks in size it makes up for with an amazing scent. 10/10 on the smellometer!

Our Harry 1

Lathyrus odoratus ‘Our Harry.’ When we started growing sweet peas, we raised well known blue varieties such as ‘Noel Sutton’. One year at Chelsea I saw this pea across a crowded floral marquee and was immediately smitten. A very reliable, scented form with big flowers, this is the very beautiful ‘Our Harry’

Sweet Pea Evening Glow (6)

Sweet Pea ‘Evening Glow’ is a notable addition to any sweet pea collection as it has a peachy tone in its soft pink flowers that is absent from most other peas. This is a connoisseurs sweet pea, it has some scent and grows vigorously. Sweet Pea ‘Valerie Harrod’ is similar in colour. This is looking very healthy and full of flower on our sweet pea canes.

EWG 5.7.12 (170)

Grandiflora Sweet Peas are sometimes called Antique or Heritage Sweet Peas. This picture shows ‘The Major’ in the foreground with red ‘Queen Alexandra’ behind. They are smaller than their newer cousins but make very gardenworthy plants because of they produce masses of flowers and have a very strong scent.

75 varieties of sweet pea are on show in the gardens now and you can find seed available for sale in the gardens or through our online shop  (Please note all photographs are Copyright Fred Cholmeley.)