Strawberries -- how to achieve sweet harvests from spring to autumn

Strawberries -- how to get a sweet harvest from spring to autumn

Strawberries are among the most popular soft fruits in Czech gardens. Growing them is not complicated, but it requires knowledge of basic principles -- from choosing the right varieties through soil preparation to pest protection. In this guide, you will learn how to ensure a continuous harvest of sweet strawberries from late spring through the first frosts.

You can find strawberry seedlings and other planting material in the seedlings category.

Ever-bearing vs. single-crop varieties

The first and most important decision is choosing the type of strawberry. There are two basic groups that differ in their fruiting method and period, and the right choice will fundamentally affect the character of your harvest.

Single-crop (short-day) varieties

These varieties fruit once a year, usually in June. The harvest is concentrated into 2-4 weeks, but it tends to be abundant and the fruits reach the largest size. An ideal choice for processing -- jams, freezing and compotes.

Recommended varieties for the Czech Republic:
- Elsanta -- the standard among single-crop varieties. Large, firm, glossy fruits with excellent flavor and transportability. Mid-early.
- Darselect -- very large fruits with intense aroma. Early variety with high yield.
- Honeoye -- very early, reliable in Czech conditions. Medium-sized, aromatic fruits.
- Korona -- sweet, aromatic, medium-sized. Good disease resistance.
- Polka -- late variety extending the season. Large, dark red fruits.

Ever-bearing (remontant) varieties

They fruit repeatedly from June to October, sometimes until the first frosts. The harvest is spread throughout the period and individual waves are smaller than with single-crop varieties, but your garden will be supplied with fresh fruits throughout the summer.

Recommended varieties for the Czech Republic:
- Ostara -- a classic ever-bearing variety, reliable and proven. Medium-sized, aromatic fruits.
- Albion -- large, firm fruits with outstanding flavor. High and regular yield.
- Mara des Bois -- a French variety with the taste and aroma of wild strawberries. Smaller fruits, but with an incomparable aroma.
- Charlotte -- very sweet, fruitful and hardy. Popular in home gardens.
- Monterey -- high yield, large fruits, good resistance to adverse conditions.

Monthly (alpine) strawberries

A special category of small strawberries with intense flavor and aroma. They fruit continuously from June to frost, do not produce runners and reproduce by division of clumps or from seed -- suitable for growing in containers.

• Mignonette -- red, highly aromatic fruits
• Yellow Wonder -- yellow fruits, sweeter, birds generally ignore them
• Rujana -- Czech variety, red, very aromatic

Planting strawberries step by step

When to plant

• Spring (March-April): Ideal for ever-bearing varieties. You will harvest your first fruit the same summer.
• Summer (July-August): The main planting period for single-crop varieties. Plants will establish their roots by winter and fruit fully in spring.
• Autumn (September-October): Possible, but plants have less time to establish roots before winter -- cover them with frost cloth.

Soil preparation

Strawberries prefer a sunny location with well-draining, humus-rich soil and pH 5.5-6.5. Adjust acidic soil with lime, overly alkaline soil with sulfur or peat. Before planting:

1. Dig the area to a depth of 25-30 cm.
2. Work in ripe compost (3-5 liters per m²) or well-aged manure.
3. If the soil is heavy and clayey, mix in sand to improve drainage.
4. Avoid areas where strawberries, potatoes or tomatoes previously grew -- there is a risk of verticillium wilt and persistent pathogens in the soil.

Correct planting procedure

• Spacing: 25-35 cm between plants, 50-60 cm between rows.
• Depth: The crown (central bud) must remain above the soil surface. Planting too deep leads to rot, planting too shallow to drying out.
• Watering: Water thoroughly immediately after planting and keep the soil evenly moist in the first few weeks.
• Spring planting: Remove the first flowers so the plant invests energy in building the root system -- in later seasons it will repay you with a richer harvest.

Mulching -- the key to healthy strawberries

Mulching is virtually essential for strawberries. It serves several crucial functions at once and significantly reduces overall care requirements.

Why mulch

• Maintains soil moisture and reduces watering needs.
• Prevents fruits from contacting damp soil, preventing gray mold.
• Suppresses weed growth.
• Regulates soil temperature and mitigates temperature fluctuations.

Mulching materials

• Straw: A traditional and proven material. A layer of 5-10 cm around plants gives the bed a typical "strawberry" look and fruits remain clean.
• Agrotextile (mulching fabric): Black fabric suppresses weeds and retains soil heat. Plant strawberries into holes cut in the fabric.
• Wood chips: Suitable for pathways between rows, not directly against plants -- they remove nitrogen from the soil as they decompose.
• Dried leaves: As autumn protection; in spring, once the risk of frost has passed, pull them back.

When to mulch

Apply mulch in spring once the soil has warmed sufficiently (April-May). In autumn, add a layer of leaves or straw as frost protection -- do not rush to pull it back until there is no risk of the plants overheating.

Care during the season

Watering

Strawberries need regular watering, especially during flowering and fruit ripening, when lack of water has the most noticeable impact on fruit size and sweetness. The recommended amount is 25-30 mm of water per week. Water in the morning directly at the roots, avoid wetting the leaves and fruits.

Drip irrigation is an ideal solution -- it evenly moistens the soil, minimizes the risk of fungal diseases and saves water.

Fertilizing

• Spring: Before flowering, apply fertilizer with a higher potassium (K) content, which supports fruit formation, size and sweetness.
• After harvest (single-crop varieties): Apply nitrogen fertilizer for regeneration and formation of new leaves before winter.
• Ever-bearing varieties: Apply fertilizer every 3-4 weeks in smaller doses throughout the season, as they continuously draw nutrients from the soil.

Removing runners

Runners (stolons) are shoots on which daughter plants form. During fruiting, remove them continuously so the plant concentrates energy on the fruits. If you want to propagate strawberries, leave 2-3 runners on each plant after harvest and root the daughter plants in pots filled with substrate.

Protection against pests and diseases

Gray mold (Botrytis cinerea)

The most common strawberry disease -- fruits are covered with a gray, felt-like growth, quickly rot and the infection spreads to neighboring fruits. Prevention: good air circulation between plants, mulching, harvesting when dry, immediate removal of affected fruits.

Powdery mildew

A white coating on leaves and fruits caused by a fungus. Prevention: selection of resistant varieties, adequate spacing, avoid overfertilizing with nitrogen which promotes lush, susceptible growth.

Slugs

They consume fruits and leaves, most active in wet weather and at night. Protection: mulching with straw (rough surface repels slugs), beer traps, biological preparations based on nematodes, evening hand collection.

Birds

Strawberries are a favorite target of blackbirds and thrushes. The most reliable protection is a bird net stretched over the bed at sufficient height. Reflective tapes and plastic predators have limited and short-term effectiveness.

Spider mites

Tiny mites that suck sap from leaves. Affected leaves turn yellow, curl and dry out. Spraying with potassium soap helps, or biological protection with predatory mite Phytoseiulus persimilis, which is a suitable alternative to chemical products.

Renewal of the strawberry bed

A strawberry bed loses productivity after 3-4 years. Plants age, fruits shrink and diseases increase. You know it's time to renew when the harvest decreases year after year even with proper care.

Renewal procedure

1. During summer, root daughter plants from runners into smaller pots with substrate.
2. In autumn or next spring, plant new plants on a freshly prepared bed -- in a different location than the original.
3. Remove the old bed and use the land for another crop (follow proper crop rotation).
4. Return to growing strawberries in the original location only after 3-4 years.

Find strawberry seedlings for bed renewal in the seedlings category.

FAQ -- Frequently asked questions

When is the best time to plant strawberries?

For single-crop varieties, the summer period is ideal (July-August) -- plants establish their roots thoroughly by winter and fruit fully in spring. Plant ever-bearing varieties in spring (March-April) to harvest later that same summer.

Can I grow strawberries in a planter on a balcony?

Absolutely. Choose ever-bearing or monthly varieties and use sufficiently large containers (at least 5 liters per plant). Use quality substrate and water regularly -- containers dry out faster than a bed. On a balcony, strawberries are protected from slugs and often do better than in a garden.

Why are my strawberries small and sour?

The most common causes: too old plants (renew the bed), insufficient sunlight (minimum 6 hours daily), insufficient watering during ripening, too many runners taking energy from the plant, or missing potassium fertilization, which directly affects fruit sweetness.

How do I protect strawberries from spring frosts?

Late spring frosts can damage flowers and destroy the entire crop. When frost is forecast, cover strawberries with non-woven fabric (frost cloth) -- even a thin layer can keep temperatures several degrees higher underneath. Do not pull back the straw layer on strawberries too early in spring while there is still risk of hard frosts -- it serves as natural insulation.