Summer annuals

Summer annuals can transform almost any patch of soil or dull corner into a vibrant, colourful display. By simply sowing seeds of annuals at the start of the season, you can grow a beautiful summer garden without much effort. Whether you start in seedling trays or directly into beds, containers or hanging baskets, you have to give summer annuals a go this season!

Most annual plants can be sown directly into the ground from early spring onwards for spring and summer flowering.

Summer annuals planting tips

For the most effective display, position plants in groups., and group according to colour and height.
When sowing or planting summer annuals it is important to group plants with similar light and water requirements together.
Plant the tallest varieties at the back, medium-height in the middle and the lowest at the front.
When growing annuals in containers consider planting low-growing or those with a trailing habit like cascade petunias for sunny spots or petunias for shady positions.
To brighten up perennial borders, plant annuals in the spaces between the permanent plants.

Preparation is key

Before sowing, start preparing the beds by removing old plants left from the previous season.
Dig over garden beds, add a generous dressing of compost, and scatter a light dressing of bone meal (high in phosphorous to help flower formation).
Just before sowing seeds or planting seedlings, rake the soil to obtain a crumbly, easily worked surface.
If you’re planting in containers or hanging baskets, use potting soil that drains well and retains moisture.
Water seedlings well before planting out.

Time to plant!

Direct sowing

Seeds can either be scattered over the whole area or sown in grooves.
When considering the distance between the grooves, keep in mind the size and height of the plants at maturity. Usually, this information can be found on the seed packet.
After sowing seeds in grooves or scattering across the bed, lightly cover them with soil by raking along the length of the grooves.
Firm down the soil with the flat side of a rake, ensure most seeds are covered and protected from the sun.

Tip | Sow seeds thinly to make thinning easier.

Transplanting seedlings

Plant out seedlings on a cool overcast day, or early in the morning or later in the afternoon when the sun is less harsh.
When removing seedlings from their trays, do not pull the leaves or stems, rather push out the root ball from the bottom of the seedling tray.
Plant seedlings out at the same depth as they were growing in the seedling tray.
Gently firm down the soil to remove air pockets and water thoroughly.
Check on your plants regularly to ensure the newly planted seedlings do not dry out.

Tip | Rather than sprinkling lightly, water the seedlings deeply to encourage deep root growth.

Caring for annuals

Fertilise seedlings with a good general fertiliser for flowering plants. For garden beds, use a granular fertiliser and for containers or hanging baskets, use a liquid fertiliser.
Remember to deadhead flowers to keep your plants neat and tidy and also to encourage flower production.