Growing Asparagus in Hawaii: Tips for a Thriving Garden

Welcome to the world of asparagus cultivation in Hawaii! Whether you’re a beginner or an experienced gardener, there’s always something new to learn about growing asparagus in this unique tropical climate. In this article, we’ll cover everything you need to know to get started with your own thriving asparagus garden.

From understanding the ideal climate and soil conditions to planting and caring for your asparagus, we’ll provide you with expert tips and advice to help you achieve a bountiful harvest. We’ll also highlight common mistakes to avoid and share techniques to extend the asparagus season in Hawaii. So, let’s get started on your journey to becoming an asparagus pro!

Understanding the Climate and Soil Conditions for Asparagus in Hawaii

One of the keys to successfully growing asparagus in Hawaii is understanding the unique climate and soil conditions that are required for the plant to thrive. Asparagus is a cool-season crop that prefers a moderate temperature range of 60 to 85 degrees Fahrenheit.

Hawaii’s year-round warm climate can pose a challenge for growing asparagus, but it’s not impossible. The key is to choose a location that has consistent airflow to prevent the plants from getting too hot.

Climate Requirements Soil Type
  • Temperature range: 60-85 degrees Fahrenheit
  • Regular rainfall (approximately 1-2 inches per week)
  • Good drainage
  • Well-draining soil with a pH of 6.0-7.0
  • Rich in organic matter or compost
  • Avoid soils that are compacted or heavy with clay

It’s also important to choose asparagus varieties that are best suited for Hawaii’s climate. Some suitable options include ‘Mary Washington’, ‘Jersey Giant’, ‘Purple Passion’, and ‘UC157’.

By ensuring that the climate and soil conditions are ideal for asparagus growth, you can set the stage for a thriving garden. In the next section, we’ll discuss how to select and prepare the asparagus bed.

Selecting and Preparing the Asparagus Bed

Before planting asparagus in Hawaii, it’s crucial to select a suitable location for your asparagus bed. Choose a spot that receives full sun and has well-drained soil to prevent waterlogging.

It’s recommended to start preparing the asparagus bed in the autumn before planting in the spring. Begin by removing all weeds and rocks from the site. You can also add organic matter, such as compost or aged manure, to improve soil fertility.

Next, dig trenches in the soil with a depth of around 6-8 inches and a width of approximately 12 inches. The trenches should be spaced at least 3 feet apart, leaving enough room for the asparagus to mature and spread.

Once the trenches are dug, add a layer of bone meal or a low-nitrogen fertilizer to the soil and mix it in well. This will help provide essential nutrients to the asparagus plants as they grow.

Finally, create a mound of soil in the bottom of each trench and arrange the asparagus crowns on top of the mound with their roots spread outwards. Cover the crowns with 2-3 inches of soil and water well.

Asparagus Bed Preparation Tips:

  • Choose a location with full sun and well-drained soil
  • Remove all weeds and rocks
  • Add organic matter to improve soil fertility
  • Dig trenches with a depth of 6-8 inches and a width of 12 inches
  • Space trenches at least 3 feet apart
  • Add bone meal or low-nitrogen fertilizer to the soil
  • Create a mound of soil in the trench to plant the crowns on

Planting Asparagus Crowns in Hawaii

Once you have prepared your asparagus bed, it’s time to start planting your crowns. Follow these steps for a successful planting:

  1. Timing: Plant your crowns in early spring, as soon as the soil is workable and has warmed up to around 50°F.
  2. Crown Preparation: Before planting, soak the asparagus crowns in warm water for at least an hour. This will help to hydrate the roots and promote faster growth.
  3. Planting: Dig a trench that is around 12 inches deep and 6 inches wide. Space the crowns 12-18 inches apart and make sure they are planted at a depth of 6-8 inches below the soil surface. Cover the crowns with a few inches of soil and water thoroughly.
  4. Care: After planting, keep the soil consistently moist until the plants emerge. Once the ferns appear, begin to reduce the frequency of watering.

Remember to avoid harvesting any spears during the first year of planting to allow the plants to establish a strong root system. You can expect to start harvesting asparagus in Hawaii the following year and continue to do so for up to 15 years with proper care and maintenance.

Watering and Fertilizing Asparagus in Hawaii

Asparagus plants in Hawaii require regular watering and fertilizing to achieve optimal growth. Here are some tips to help you keep your asparagus plants healthy and thriving:


Asparagus plants need consistent moisture to grow properly, especially during the growing season. Water deeply once a week, providing at least one inch of water.

Avoid overwatering, as too much moisture can cause root rot and other diseases. The soil should be well-drained to prevent standing water. If you are unsure about how much water your plants need, check the soil’s moisture level by sticking your finger two inches into the soil and feeling the moisture level.


Fertilizing your asparagus plants is also crucial for their growth. A balanced fertilizer with equal amounts of nitrogen, phosphorus, and potassium is recommended for asparagus plants. However, avoid fertilizers that are high in nitrogen, as they can cause the plants to produce more foliage than spears.

Fertilize your plants in the early spring before the spears start to emerge and again after the last harvest. Follow the instructions on the fertilizer package for the recommended application rate, as over-fertilization can harm the plants.

By providing your asparagus plants with the proper watering and fertilizing, you can ensure a bountiful harvest of delicious spears.

Managing Pests and Diseases in Hawaii Asparagus

Asparagus plants in Hawaii are susceptible to various pests and diseases that can affect their growth and yield. It is essential to be vigilant and take preventive measures to manage these issues to ensure a healthy and thriving crop.

Common Pests in Hawaii Asparagus

One of the most common pests that affect asparagus plants in Hawaii is the asparagus beetle. These beetles can cause significant damage to the foliage and stems of the plant, leading to stunted growth and reduced yield. To manage this pest, it is important to keep the area around the plants clear of debris and remove any infested plants or plant parts promptly.

Other pests that may affect asparagus in Hawaii include aphids, cutworms, and slugs. These can be managed using organic methods such as companion planting, manual removal, and the use of insecticidal soaps or oils.

Diseases Affecting Hawaii Asparagus

The most common diseases that affect asparagus plants in Hawaii are Fusarium root rot and asparagus rust. Fusarium root rot can cause wilting and yellowing of the foliage, and stunted plant growth. Asparagus rust, on the other hand, manifests as orange-colored spots on the foliage and stems, which eventually turn black and cause the plant to die. To prevent these diseases, it is crucial to practice good soil hygiene, avoid overwatering, and remove any infected plant parts promptly.

Preventive Measures for Pests and Diseases

Preventing pests and diseases in asparagus plants in Hawaii involves a combination of good gardening practices and the use of organic solutions. Some preventive measures to consider include:

  • Keeping the area around the plants free of weeds and debris;
  • Practicing proper crop rotation and avoiding planting asparagus in the same location for consecutive years;
  • Using companion plants, such as marigolds and dill, to repel pests;
  • Using organic insecticides and fungicides only when necessary;
  • Removing any infected plants or plant parts promptly and disposing of them properly.

Following these preventive measures can help reduce the risk of pests and diseases affecting your asparagus crop in Hawaii. By being proactive and taking prompt action when necessary, you can ensure that your plants remain healthy and productive throughout the growing season.

Harvesting and Storing Asparagus in Hawaii

Harvesting asparagus is a rewarding experience, and doing it right ensures a continued supply of this delicious vegetable. The timing of the harvest is critical to the overall productivity of the plant, so it’s important to know when and how to harvest.

The first asparagus spears will appear in early spring, roughly 2-3 years after planting. The best time to harvest is when the spears are about 6-8 inches tall and as thick as a pencil. To harvest, gently snap the spear at the base, or use a sharp knife to cut it about an inch below the soil surface. Be careful not to damage any other emerging spears while harvesting.

Asparagus can be stored in the refrigerator for up to a week, but it’s best to eat it as fresh as possible to enjoy its full flavor. To extend the storage life of asparagus, you can blanch it by boiling for 2-3 minutes, then immediately placing it in ice water to cool. Once cooled, drain the excess water and store in an airtight container in the refrigerator for up to 8 months.

Extending the Asparagus Season in Hawaii

Asparagus is a seasonal crop, but with proper planning and management, you can extend the harvest season in Hawaii. Here are some tips to help you get the most out of your asparagus garden:

  1. Succession planting: Planting multiple batches of asparagus crowns in intervals of two weeks can help stagger the harvest. This way, you can enjoy fresh asparagus for a longer period.
  2. Harvest management: By adjusting your harvest schedule, you can control how long your asparagus season lasts. Start by harvesting only a few spears from each plant during the first year, and gradually increase the number of spears harvested in subsequent years. This will encourage the plants to produce more spears throughout the season.
  3. Frost protection: Asparagus can tolerate some frost, but a hard freeze can damage the foliage and reduce the yield. Covering your asparagus bed with a frost cloth or blanket can provide protection during cold snaps.

By following these practices, you can enjoy your asparagus harvest for an extended period in Hawaii.

Common Mistakes to Avoid in Growing Asparagus in Hawaii

Asparagus is a delicious and healthy addition to any garden, but growing it in Hawaii comes with its own set of challenges. To help you avoid common mistakes, here are some tips to keep in mind:

  • Overcrowding: Asparagus plants need plenty of space to grow and produce a good harvest. Be sure to plant them at least 18 inches apart, and avoid overcrowding the bed.
  • Poor Soil Preparation: Asparagus thrives in well-drained soil that is rich in organic matter. Make sure to properly amend the soil with compost or other organic materials before planting.
  • Underwatering: Asparagus requires consistent moisture throughout the growing season. Make sure to water deeply and regularly, especially during dry periods.
  • Overfertilizing: Although asparagus benefits from regular fertilization, too much can be harmful. Avoid using high-nitrogen fertilizers, which can promote foliage growth at the expense of root development.
  • Poor Pest and Disease Management: Asparagus can be susceptible to pests and diseases, which can significantly impact the plant’s health and yield. Be sure to monitor your plants regularly and take appropriate measures to prevent and manage issues.

By keeping these tips in mind, you can avoid common mistakes and enjoy a thriving asparagus garden in Hawaii.

Asparagus Companion Plants in Hawaii

Companion planting is an excellent way to promote plant growth while naturally preventing pests and diseases. Asparagus plants in Hawaii can benefit from having certain companion plants nearby.

Nasturtiums are a popular choice for asparagus companion planting as they attract beneficial insects like ladybugs and hoverflies, which prey on harmful pests and parasites. Their flowers are also edible and make a great colorful addition to salads.

Companion Plant Benefits
Basil Repels asparagus beetles and spider mites, improves flavor of nearby plants
Parsley Helps asparagus growth and repels harmful insects
Marigolds Deters nematodes and other harmful organisms

Basil is another excellent companion plant for asparagus, as it helps to repel pests like asparagus beetles and spider mites while also improving the flavor of nearby plants.

Parsley is also a useful companion plant as it helps with asparagus growth and repels harmful insects. In addition, marigolds are known to deter nematodes and other harmful organisms that can damage asparagus plants.

When choosing companion plants for your asparagus, be sure to select varieties that have similar growing conditions and have roots that won’t compete with the asparagus. Consider planting companion plants in between asparagus rows to make the most out of the space in your garden.

Asparagus Maintenance and Care in Hawaii

Once your asparagus garden is established, it’s important to maintain and care for your plants properly. Here are some guidelines for ongoing care:

Weed Control

Weeding is important to ensure your asparagus plants have access to adequate nutrients and water. Regularly remove weeds, preferably by hand, to prevent disturbing the roots of your asparagus plants.


Mulching your asparagus bed can help retain moisture and regulate soil temperature. Use a layer of organic matter, such as straw or leaves, and apply it around your plants, taking care not to cover the crowns.

Seasonal Tasks

Asparagus plants require different care during different seasons:

  • Spring: In early spring, remove any dead foliage that may have accumulated over the winter. Check for any signs of pests or diseases and address them promptly.
  • Summer: Keep your asparagus bed well-watered during hot and dry weather. If your plants are producing berries, remove them to prevent the plants from focusing on seed production rather than spear production.
  • Fall: After the last harvest of the season, allow the foliage to turn yellow and die back before cutting it down to the ground. Add a layer of compost or manure to the bed.
  • Winter: Cover your asparagus bed with a layer of mulch to protect the crowns from frost.


Harvest asparagus spears when they’re 7-9 inches tall and the tips are tight. Cut the spears at ground level, taking care not to damage other emerging spears. Stop harvesting when the diameter of the spears decreases significantly.

With the right care and attention, your asparagus garden can provide years of delicious and healthy harvests. Happy growing!


Growing asparagus in Hawaii can be a rewarding experience if you follow the right techniques and practices. By understanding the unique climate and soil conditions of Hawaii and selecting the appropriate varieties, you can have a thriving garden of asparagus in no time.

Final Thoughts

We hope this guide has been helpful in providing you with the necessary tips and information to grow asparagus successfully in Hawaii. Remember to choose a well-drained location for the asparagus bed, plant at the correct depth and spacing, and water and fertilize the plants regularly.

Managing pests and diseases, harvesting correctly, and extending the season are also crucial factors to keep in mind. Don’t forget to maintain the asparagus bed regularly and avoid common mistakes that can hinder the growth and quality of the crop.

Finally, consider companion planting and experiment with different varieties to enhance the flavor and nutrition of your asparagus. With a little patience and care, you can enjoy a delicious and healthy harvest of asparagus from your own backyard garden.


Q: What are some tips for growing asparagus in Hawaii?

A: When growing asparagus in Hawaii, it is important to consider the unique climate and soil conditions. Some tips for a thriving garden include selecting the right asparagus varieties, preparing the bed properly, and managing pests and diseases effectively.

Q: What are the ideal climate and soil conditions for asparagus in Hawaii?

A: Asparagus in Hawaii thrives in a temperature range of 60-80 degrees Fahrenheit. It requires well-drained soil with a pH level between 6.0 and 7.0. Asparagus varieties suitable for Hawaii’s climate include ‘Mary Washington’ and ‘UC157’.

Q: How do I prepare the asparagus bed in Hawaii?

A: To prepare the asparagus bed in Hawaii, choose a location with good drainage. Remove any weeds or grass from the area and amend the soil with organic matter. It is important to ensure that the soil is loose and well-drained for optimal growth.

Q: What is the proper way to plant asparagus crowns in Hawaii?

A: When planting asparagus crowns in Hawaii, make sure to space them about 18-24 inches apart in rows that are 3-4 feet apart. Dig a trench deep enough to accommodate the crowns and cover them with 2 inches of soil initially. As the plants grow, gradually fill in the trench with soil.

Q: How often should I water and fertilize asparagus plants in Hawaii?

A: Asparagus plants in Hawaii should be watered regularly, aiming for about 1 inch of water per week. Fertilize the plants with a balanced fertilizer, following the package instructions. Apply the fertilizer in early spring and mid-summer for optimal growth.

Q: What are common pests and diseases that affect asparagus in Hawaii?

A: Common pests that affect asparagus in Hawaii include asparagus beetles and aphids. Diseases such as Fusarium crown and root rot can also pose a threat. It is important to monitor the plants regularly and take preventive measures such as removing affected foliage and using organic pest control methods.

Q: How do I harvest and store asparagus in Hawaii?

A: Harvest asparagus spears in Hawaii when they are 6-8 inches tall and snap easily. Cut the spears at ground level using a sharp knife or scissors. To store asparagus, place the freshly harvested spears in a plastic bag and refrigerate them. They can be kept fresh for up to a week.

Q: How can I extend the asparagus season in Hawaii?

A: To extend the asparagus season in Hawaii, you can practice succession planting by sowing seeds or planting new crowns at different times. Harvesting the spears regularly and managing the plants’ growth can also help maximize production and extend the season.

Q: What are some common mistakes to avoid in growing asparagus in Hawaii?

A: Some common mistakes to avoid when growing asparagus in Hawaii include planting in poorly drained soil, overcrowding the plants, and neglecting proper maintenance. It is important to follow recommended planting and care practices to ensure a successful garden.

Q: What are suitable companion plants for asparagus in Hawaii?

A: Some suitable companion plants for asparagus in Hawaii include tomatoes, parsley, and marigolds. These plants can help repel pests and enhance the growth and health of asparagus. Avoid planting asparagus with onions, garlic, or other plants from the Allium family.

Q: How do I maintain and care for asparagus plants in Hawaii?

A: To maintain and care for asparagus plants in Hawaii, practice regular weed control by mulching the bed. Remove any weeds that may compete for nutrients. In the fall, cut back the yellowing ferns and add a layer of organic mulch to protect the crowns during winter.