Gardening tips for the ornamental garden in April
Now things are really getting going in the garden! April is a month of dynamism: Everything is growing, sprouting, and beginning to bloom. At the same time, the garden is still sensitive to late frosts, so a little caution is also required. With the right care steps and planting activities, you can get your ornamental garden into full swing now.

Prepare beds and remove weeds
The beds are now mostly dry and ready for the new season. Loosen the soil, work in compost if necessary, and remove stubborn weeds. You should especially remove root weeds like ground elder or couch grass thoroughly before they really take root.
Summer flowers directly or prefer
April is ideal for starting many summer flowers or sowing them in a sheltered bed.
You can now grow these varieties:
- Zinnia 'Benary's Giant Golden Yellow'
- Zinnia 'Zinderella Peach'
- Jewelery basket 'Double Click Bicolor'
- Celosia
- Summer aster
- Sea lavender
Use pots or seed trays in a cold frame, greenhouse, or on a windowsill. Ensure consistent humidity, good light, and sufficient warmth – a fleece helps on cool nights.
Planting and dividing perennials
Perennials are perfect for planting now, or even dividing if they've grown too large. When dividing, look for strong root sections that can sprout new shoots. Asters, coneflowers, lady's mantle, geraniums, and heuchera are particularly suitable now.

Fertilizing roses, hydrangeas & Co.
Give your roses and other flowering shrubs a slow-release organic fertilizer now to strengthen them for the flowering season. Hydrangeas and perennials also benefit from their first application of fertilizer.
Planting dahlias & tubers
Now is the time to plant dahlia tubers back in the ground – provided the soil is frost-free. Begonias, montbretias, and gladiolas can also be planted now. In harsher climates, pre-cultivation in pots is recommended.
Keep snails away
As soon as it gets warmer, snails will pick up the pace again. Check for new growth regularly, install snail rings or fences, and collect snails in the morning and evening during wet weather.
Planting balcony boxes and pots
From mid-April – if the weather is mild – you can start spring planting pots and window boxes. Horned violets, primroses, forget-me-nots, and bellis provide early splashes of color. For more delicate plants, keep them indoors or cover them at night!
Supporting birds with nesting
Now is nesting season—check and clean nesting boxes, hang new ones, and make sure to leave places to retreat to in the garden. Piles of leaves, dense shrubs, and small water features make your garden bird-friendly.
Frequently asked questions (FAQ) about ornamental gardens in April
Which summer flowers can I sow directly in April?
Marigolds, cosmos, nasturtiums, cornflowers or calendula can be sown directly into the bed in mild weather.
Are dahlias already frost-resistant?
No – dahlias are sensitive to frost. Plant them only when the weather is stable, or grow them in pots and plant them out later.
When can balcony flowers be left outside permanently?
Sensitive balcony flowers should only be placed outdoors permanently after the Ice Saints (mid-May). Early bloomers are more robust.
Should I fertilize now?
Yes – especially perennials, roses, hydrangeas and early bloomers now benefit from organic fertilizer.
What can I do about snails?
Check regularly now, remove hiding places, set up snail fences and collect them early – that helps best.