July 24, 2024

How cranberries are grown | Everything you should know

Have you ever wondered about the journey that cranberries take before they end up on your plate? It’s a captivating process that combines careful cultivation, nature’s ingenuity, and the dedication of skilled farmers.

Join us as we delve into the world of cranberry cultivation and uncover the fascinating steps involved in growing these tart and vibrant berries. From the sprawling cranberry fields to the meticulous harvesting techniques, get ready to explore the remarkable journey of how cranberries are grown, and gain a deeper appreciation for the delicious fruit that graces our tables.

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About Cranberries

Cranberries are a unique type of fruit that belong to the Ericaceae family and are native to North America. They grow on low-lying vines in acidic, sandy bogs or marshes known as cranberry bogs. These bogs are often found in the northeastern United States, Canada, and other parts of the world with similar climates.

Cranberries have a rich history and have been used for centuries by Native American tribes for various purposes. They were highly valued for their medicinal properties and were also used as a natural dye for textiles.

In the early days of European colonization, cranberries became popular among settlers and were incorporated into traditional Thanksgiving meals. Over time, their popularity grew, and cranberries became a widely cultivated commercial crop.

One interesting fact about cranberries is their unique ability to float. When ripe, cranberries have air pockets in them, allowing them to float on the surface of water. This characteristic has been cleverly utilized in the traditional method of harvesting cranberries, known as “wet harvesting.” During wet harvesting, bogs are flooded, and the cranberries are loosened from the vines. Then, special equipment is used to gather the floating berries.

Where Do Cranberries Grow

Cranberries primarily grow in the northern regions of North America, particularly in the United States and Canada. The United States is the largest producer of cranberries, with the majority of commercial cranberry production concentrated in the states of Wisconsin, Massachusetts, New Jersey, Oregon, and Washington. These regions provide the ideal climate and growing conditions for cranberries, including acidic soil, ample sunlight, and access to water.

In Canada, cranberries are predominantly grown in the provinces of British Columbia, Quebec, and Nova Scotia. These areas offer suitable environments with cool temperatures and well-drained soils.

While North America is the main hub for cranberry cultivation, cranberries are also grown in other parts of the world with similar climatic conditions. This includes regions in Chile, Northern Europe (such as Finland and Sweden), and certain areas of Russia.

Cranberries thrive in boggy or marshy areas, characterized by acidic, sandy soils. These unique growing conditions, combined with the cultural practices adopted by cranberry farmers, help create the ideal habitat for cranberry plants to flourish and produce their vibrant, tart berries.

How Do Cranberries Grow

Cranberries grow on low-lying vines that spread along the ground and form dense mats. The process of cranberry growth and cultivation involves several stages:

1. Planting

Cranberries are typically grown from cuttings or propagated using specialized cranberry plant nursery stock. The cuttings or nursery plants are planted in well-prepared fields or cranberry bogs. Cranberry plants require specific soil conditions, including acidity and proper drainage.

2. Vine Development

Once planted, the cranberry vines start to establish themselves. They produce runners, which are thin, elongated stems that spread along the ground. New upright shoots, known as uprights, grow from these runners.

3. Flowering

In the spring, the cranberry vines produce delicate pink flowers. These flowers are pollinated by bees and other insects, leading to the formation of small green berries known as cranberry fruit.

4. Berry Development

Over the summer months, the green cranberry fruit gradually grows and undergoes color changes. They turn from green to various shades of red as they ripen. The berries develop air pockets inside them, which allows them to float in water.

5. Harvesting

Cranberries are typically harvested in the fall, usually between September and November. There are two primary methods of harvesting cranberries. In the traditional method known as “wet harvesting,” bogs are flooded with water, and special equipment is used to dislodge the ripe berries from the vines.

The berries float to the surface, making them easier to gather. In the alternative method of “dry harvesting,” mechanical harvesters comb through the dry cranberry fields, removing the berries from the vines.

6. Sorting and Packaging

After harvesting, the cranberries are sorted to remove any damaged or unripe berries. They are then packaged for distribution to markets, processing facilities, or for further value-added products.

It’s important to note that cranberry plants are perennial, meaning they can live and produce berries for many years. With proper care and maintenance, cranberry beds can continue to yield crops for several decades.

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Best climate and site for growing cranberries

Cranberries are native to North America and require specific climatic and site conditions to thrive. Here are the best climate and site requirements for growing cranberries:

1. Climate

  • Cool and temperate climate: Cranberries grow best in regions with cool summers and cold winters.
  • Frost-free growing season: They require a frost-free period of approximately 150 to 180 days.
  • Adequate chilling hours: Cranberries need a sufficient number of chilling hours during the dormant period to break bud dormancy in spring.

2. Site Requirements

  • Acidic soil: Cranberries prefer acidic soil with a pH range of 4.0 to 5.5. Soil pH should be regularly monitored and adjusted if necessary.
  • Well-drained soil: The ideal soil for cranberries is sandy or peaty with good drainage to prevent waterlogging.
  • Moisture and water management: Cranberries require consistently moist soil. They are typically grown in areas with a high water table or where irrigation can be effectively managed.
  • Sunlight: Cranberries need full sun exposure for optimum growth and fruit development.
  • Protection from strong winds: Consider planting cranberries in a location shielded from strong winds, as they can damage the plants and affect fruit production.

3. Geographic Regions

  • Northern United States: Cranberries are extensively cultivated in states such as Massachusetts, Wisconsin, New Jersey, Oregon, and Washington.
  • Eastern Canada: Cranberry cultivation is prominent in provinces like Quebec and Nova Scotia.
  • Northern Europe: Countries like the Netherlands and Poland have suitable climates for cranberry production.
  • Chile: Some regions of Chile, particularly in the southern part, have favorable conditions for growing cranberries.

How to Care for Cranberries

Caring for cranberries involves several essential practices to ensure healthy plant growth and maximize fruit production. Here are some key care guidelines for cranberries:

1. Watering

  • Cranberries require consistently moist soil. Irrigate regularly to maintain soil moisture levels, especially during dry periods.
  • Avoid waterlogging, as excessive moisture can lead to root rot. Proper drainage is crucial.
  • During the growing season, cranberries may require 1 to 1.5 inches of water per week.

2. Fertilization

  • Conduct a soil test to determine the nutrient requirements of your cranberry plants. This will help you apply the appropriate fertilizer.
  • Cranberries typically require acidic fertilizers with a pH range of 4.0 to 5.5.
  • Apply fertilizers rich in phosphorus and potassium, as these nutrients promote root development and fruiting. Nitrogen should be applied sparingly to avoid excessive vegetative growth.
  • Follow the recommended application rates and timing provided by local experts or based on soil test results.

3. Mulching

  • Apply a layer of organic mulch, such as straw or wood chips, around cranberry plants. Mulching helps conserve moisture, suppress weed growth, and maintain a stable soil temperature.
  • Avoid using alkaline materials as mulch, as cranberries prefer acidic conditions.

4. Weed Control

  • Manage weeds around cranberry plants through regular cultivation, hand weeding, or the use of herbicides labeled for cranberry production.
  • Weeds compete with cranberries for nutrients and water, so it’s important to keep the area around the plants weed-free.

5. Pruning

  • Pruning is generally not necessary for cranberries unless there is excessive vegetative growth or disease-infected branches.
  • Remove any dead or diseased branches promptly to maintain plant health.

6. Pest and Disease Control

  • Monitor cranberry plants regularly for pests such as cranberry fruitworm, cranberry weevil, and cranberry tipworm. Consult local agricultural extension services for specific pest management recommendations.
  • Common cranberry diseases include fruit rot, leaf spot, and mummy berry. Follow recommended disease management practices, including proper sanitation, fungicide application, and removal of infected plant material.

7. Winter Protection

  • In regions with cold winters, protect cranberry plants from frost damage by flooding the beds with water to create an insulating ice layer. This helps shield the plants from extreme temperature fluctuations.

8. Harvesting

  • Cranberries are typically ready for harvest in the fall. Harvest when the berries have developed their characteristic deep red color.
  • Gently rake or comb the cranberries off the vines. They should detach easily when ripe.

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How to water Cranberries

Cranberries must receive the right amount of water to thrive and produce fruit. Here is advice on effectively watering cranberries:

1. Understand Cranberry Watering Needs

Cranberries require consistently moist soil. The goal is to maintain a steady level of moisture without waterlogging the plants.

Proper irrigation helps cranberries develop deep root systems and encourages fruiting.

2. Determine Watering Frequency

Regular irrigation is necessary, especially during dry spells, for cranberries. Weather, soil type, and plant age are some of the variables that affect how often to water a plant.

During the growing season, cranberries may need 1 to 1.5 inches of water each week as a general rule.

3. Choose the Right Irrigation Method

Flooding: Flooding is a common irrigation method for cranberries. To ensure consistent moisture, the beds are flooded with water, covering the vines. This method also helps with winter protection and weed control. The water is drained before the next irrigation cycle.

Drip Irrigation: Drip irrigation can also be used for cranberries. It delivers water directly to the root zone, reducing water waste and minimizing weed growth.

4. Monitor Soil Moisture

Regularly check the moisture level in the soil to determine when watering is necessary. Stick your finger or a soil moisture meter into the soil to gauge the moisture content.

Cranberries prefer soil moisture levels that are consistently moist but not saturated. Aim for a moisture content that is evenly distributed throughout the root zone.

5. Time Watering Appropriately

It is typically advised to water in the morning so that the leaves can dry out over the day. By doing this, the likelihood of diseases brought on by prolonged dampness on the leaves is decreased.

To avoid persistent leaf moisture over night, avoid watering in the late afternoon or evening.

6. Adjust Irrigation Based on Weather Conditions

Cranberries may require more frequent watering during hot and dry weather to compensate for increased evaporation and plant water demand.

Rainfall can contribute to soil moisture, so adjust irrigation accordingly. If there has been adequate rainfall, you may need to reduce the amount and frequency of irrigation.

7. Consider Environmental Factors

When choosing the frequency and length of irrigation, consider the soil type, drainage, and regional climate.

While heavier or clayey soils may store moisture longer and require less frequent watering, sandier or well-drained soils may need more regular watering.

How to propagating cranberries

Cranberries can be propagated through a few different methods, including seed propagation, division of established plants, and stem cuttings. Here’s a guide on how to propagate cranberries:

1. Seed Propagation

  1. Collect cranberry seeds from ripe berries. Rinse the seeds to remove any pulp or residue.
  2. Stratify the seeds by placing them in a damp paper towel or peat moss in a plastic bag and refrigerating them for about 90 to 120 days. This mimics the natural cold stratification process.
  3. After stratification, sow the seeds in seed trays or small pots filled with a well-draining, acidic soil mix.
  4. Keep the soil consistently moist and provide indirect light.
  5. Germination can take several weeks to a couple of months. Once the seedlings have developed a few sets of true leaves, they can be transplanted into larger containers or directly into the ground.

2. Division

  1. Established cranberry plants can be divided to create new plants.
  2. In early spring, when the plants are emerging from dormancy, carefully dig up the plant clumps.
  3. Gently separate the clumps into smaller sections, ensuring each division has sufficient roots and shoots.
  4. Replant the divisions immediately into prepared beds or containers with well-draining acidic soil.
  5. Keep the divisions well-watered and provide them with appropriate sunlight for optimal growth.

3. Stem Cuttings

  1. Select healthy, disease-free cranberry stems in early spring or late fall for stem cuttings.
  2. Cut 4 to 6-inch long sections of stems, making sure each cutting has at least two to three leaf nodes.
  3. Remove the leaves from the lower half of the stem.
  4. Dip the cut end of each stem cutting into a rooting hormone to promote root development (optional).
  5. Plant the stem cuttings vertically in pots or trays filled with a well-draining rooting medium, such as a mixture of peat moss and sand.
  6. Keep the cuttings moist and provide them with indirect light or partial shade.
  7. Rooting should occur within a few weeks to a couple of months. Once the cuttings have developed a well-established root system, they can be transplanted into larger containers or directly into the ground.

How are cranberries harvested

Cranberries are typically harvested using a process called “wet harvesting.” Here’s a step-by-step guide on how cranberries are harvested:

1. Timing: Cranberries are ready for harvest in the fall, usually from late September to early November, depending on the region and variety. Harvesting is typically done when the berries have developed their characteristic deep red color.

2. Flooding: Prior to harvest, cranberry fields are flooded with water. Flooding serves several purposes:

  • Eases the mechanical harvesting process: The flooded fields allow the cranberries to float to the surface, making them easier to collect.
  • Protects the fruit: The floating berries are less susceptible to damage during the harvesting process.
  • Aids in weed control: Flooding helps dislodge and remove weed growth.

3. Harvesting Equipment: Specialized harvesting equipment, often referred to as “beaters” or “combines,” is used for cranberry harvest. These machines have large reels or beaters with tines that gently agitate the water to detach the berries from the vines.

4. Collection: As the harvesting equipment moves through the flooded cranberry beds, the agitated berries become dislodged from the vines and float to the surface of the water.

5. Corralling: To collect the floating cranberries, workers may use booms, large floating barriers, or conveyor systems to corral the berries into concentrated areas for easier collection.

6. Scooping: Once the berries are corralled, workers use handheld scoops or other equipment to gather the floating cranberries into containers or bins. They carefully skim the surface of the water to avoid collecting excess debris.

7. Transport and Processing: Collected cranberries are then transported to processing facilities. At the facility, the cranberries are cleaned, sorted, and packaged for distribution to markets or further processing.

Do cranberries grow in water

While cranberries are often associated with being grown in water, they do not naturally grow fully submerged. However, cranberries have a unique adaptation where they can tolerate and thrive in wet or waterlogged conditions.

This adaptation is utilized during the harvesting process, which involves flooding the cranberry fields. The flooding serves the purpose of easing the mechanical harvesting process, protecting the fruit, and aiding in weed control.

During the growing season, cranberry plants are typically grown in well-drained sandy or peaty soils with a high water table. The soil is kept consistently moist but not waterlogged. Adequate soil moisture is essential for cranberries to grow and produce fruit, but they do not require continuous submersion in water.

What will happens in each season on a cranberry farm

A cranberry farm experiences distinct activities and changes throughout the seasons. Here’s a general overview of what typically happens on a cranberry farm during each season:


  • March to May: In early spring, as the weather warms up, cranberry plants emerge from their dormant state.
  • Pruning: Any necessary pruning of the cranberry plants is done during this time to remove dead or diseased branches and promote healthy growth.
  • Fertilization: Spring is a common time for applying fertilizers to provide the necessary nutrients for plant growth.
  • Weed control: Weed management practices, such as cultivation or herbicide application, are implemented to control weed growth and prevent competition with the cranberry plants.
  • Irrigation: Depending on the region and rainfall patterns, irrigation may be initiated to ensure sufficient soil moisture for the growing cranberries.


  • June to August: Summer is a period of active growth and fruit development for cranberries.
  • Flowering and pollination: Cranberry plants produce delicate pink flowers, and pollination occurs with the help of bees and other pollinators.
  • Pest and disease management: Monitoring for pests and diseases is important during this season. Appropriate measures are taken to control pests and minimize disease outbreaks.
  • Irrigation: Adequate irrigation is crucial during hot and dry periods to maintain soil moisture and support plant health.
  • Weed control: Regular weed management practices continue to prevent weed competition.


  • September to November: Fall is the main harvest season for cranberries.
  • Harvesting: Cranberries are typically harvested using the wet harvesting method, where fields are flooded and berries are collected from the floating surface.
  • Sorting and processing: Harvested cranberries are transported to processing facilities, where they are cleaned, sorted, and packaged for distribution or further processing.
  • Plant dormancy: As fall progresses, cranberry plants transition into dormancy in preparation for winter.


  • December to February: Winter is a period of dormancy and rest for cranberry plants.
  • Winter protection: In colder regions, farmers may provide winter protection to cranberry plants by flooding the beds with water, forming an insulating ice layer that helps shield the plants from extreme temperatures.
  • Planning and maintenance: Winter is a time for planning upcoming activities, performing equipment maintenance, and preparing for the next growing season.

Conclusion: How cranberries are grown 

Cranberries are fascinating fruits that are cultivated through specialized farming techniques. Growing cranberries involves careful consideration of their unique requirements, such as acidic soil, adequate moisture, and proper irrigation.