Work in an Olive Grove in March and April

Olive trees are perennial, long-lived trees that need constant care throughout the year to ensure optimal fruit production and high-quality oil. March and April are transitional months between winter and summer, marked by essential work that prepares the trees for the growing season and fruit set. During this period, growers focus on maintenance pruning, fertilising, irrigation, pest and disease control, and soil work. These tasks are crucial for the health of the trees and for a generous harvest at the end of the year.

1. Pruning (maintenance and rejuvenation pruning)

One of the most important jobs in this period is the maintenance pruning of the olive trees. It ensures good air circulation in the canopy, lets sunlight through and keeps the balance between vegetative growth and fruit production.

Types of pruning carried out in March and April:

• Removing dry or diseased shoots – This helps prevent the spread of disease and keeps the tree healthy overall.
• Removing vertically growing branches – These use up a lot of the tree's energy and reduce its fruiting potential.
• Cutting out crossing branches or branches that block the sunlight – A well-ventilated canopy reduces the risk of fungal diseases and ensures the fruit develops evenly.
• Rejuvenation pruning (where needed) – On older trees, or trees weakened by the climate, a more drastic pruning can stimulate the growth of new, healthy shoots.

After pruning, it is recommended to treat the pruning wounds with a fungicide or wound sealant to prevent infection.

2. Fertilising and enriching the soil

After the winter months, olive trees need a considerable amount of nutrients to support the growth of new shoots and flowering. In March and April the soil is prepared by fertilising it and enriching it with essential nutrients.

Types of fertiliser used:

• Organic fertilisers (well-rotted manure, compost, humus) – Improve soil structure and release nutrients gradually.
• Mineral fertilisers – Nitrogen (N) is essential for vegetative growth, phosphorus (P) supports flowering and potassium (K) promotes fruit set and resistance to disease.
• Micronutrient supplements – Zinc, boron and magnesium are crucial for normal photosynthesis and optimal fruit development.

Growers usually apply fertiliser just before or immediately after rain, so the roots absorb the nutrients better.

3. Irrigation and water management

Olive trees are drought-resistant, but in early spring they need enough moisture to support the growth of new shoots and the development of flowers. Depending on the climate, the following irrigation methods can be used:

• Drip irrigation – The most efficient method, bringing water straight to the roots and keeping evaporation to a minimum.
• Sprinkler irrigation – Used less often, but useful in drier regions.
• Watering by hand – In small groves, targeted watering tree by tree, especially in dry years, is a workable option.

To retain soil moisture, growers can spread mulch around the base of the trees, such as straw, dry leaves or plant residues.

4. Pest and disease control

Spring is a period when olive trees are more vulnerable to pests and diseases.

Main pests in this period:

• Olive fruit fly (Bactrocera oleae) – Can greatly reduce production if not tackled in time. Pheromone traps or organic treatments are often used.
• Scale insects (Saissetia oleae) – Attack leaves and young shoots and reduce the tree's vigour. They can be controlled with treatments based on horticultural oil.
• Mites – Can cause leaf deformation and stunted growth. Sulphur-based or organic solutions are effective.

Main diseases occurring in March and April:

• Olive leaf spot (Spilocaea oleagina) – Shows as dark spots on the leaves. Treatment with copper-based fungicides is recommended.
• Verticillium wilt – A fungal disease that attacks the tree's vascular system. Using resistant varieties and preventive measures is advisable.

To keep the grove healthy, growers apply preventive treatments with organic or chemical products and keep a constant eye on the trees for signs of infestation.

5. Preparing for flowering and pollination

At the end of April the olive trees begin to flower. This is a crucial moment, as fruit production depends on the quality of pollination. Growers can support this process by:

• Ensuring good air circulation in the grove (through correct pruning).
• Placing beehives near the grove to encourage pollination.
• Avoiding chemical treatments during flowering, as these can harm pollinators.

6. General maintenance

Besides the essential tasks for the health of the trees, March and April also involve other important maintenance work:

• Weeding – To reduce competition for water and nutrients.
• Checking and repairing the irrigation system – To prevent water loss.
• Cleaning and maintaining the soil – Through light tillage and levelling where needed.

Conclusion

March and April are key months for the healthy development of olive trees. From pruning to fertilising, irrigation and pest control: all this work contributes to a healthy, productive grove. Proper care during this period leads to a richer harvest and high-quality olive oil. Would you like to taste what careful cultivation produces? Discover our extra virgin olive oil from Puglia.

Frequently asked questions

When is the best time to prune olive trees?

The ideal time for maintenance pruning is late winter and early spring, usually between February and April. By then the worst frosts are over, but the trees are not yet in full growth. Pruning too late, during flowering, can have a negative effect on fruit production.

What is the difference between organic and chemical crop protection in the olive grove?

Organic crop protection uses natural means such as pheromone traps, horticultural oil and copper-based fungicides that are permitted in organic farming. Chemical treatments often work faster but can leave residues and are harmful to beneficial insects such as bees. At Uliveto di Mede we deliberately choose an approach that is as natural as possible.

When do olive trees start to flower, and what makes for good pollination?

Olive trees usually flower from late April to early May, depending on the variety and the region. Good pollination depends on enough airflow through the grove, the presence of pollinators such as bees, and avoiding chemical treatments during flowering. Cross-pollination between different varieties also increases fruit production.