30+ Weeds with Blue Flowers: Identification Guide and Tips for Garden Management

30+ Weeds with Blue Flowers: Identification Guide and Tips for Garden Management



When it comes to plants with blue flowers, we often think of cultivated varieties like bluebells or hydrangeas. But did you know that there are also numerous weeds that produce beautiful blue blooms? In this identification guide, we will explore over 30 different weeds that have blue flowers. While these plants may be considered weeds in some areas, they can still add a pop of color to your garden or serve as valuable food and medicine sources in a survival situation. Let’s dive in and discover what nature has to offer!

Azure Sage (Salvia azurea)

Azure Sage, also known as Pitcher Sage, is a stunning native plant with tall spikes of sky-blue flowers. It attracts pollinators like bees and butterflies and can reach heights of up to 4 feet. Azure Sage is drought-tolerant and thrives in full sun. While it may be considered a weed in certain regions, its beauty and ability to support local wildlife make it worth considering for your garden.

My 2 Cents:

If you live in an area where Azure Sage is considered a weed, consider allowing it to grow in a designated area of your garden. Not only will you enjoy its vibrant blue flowers, but you’ll also be providing a valuable food source for pollinators.

Forget-Me-Not (Myosotis spp.)

Forget-Me-Not is a well-known wildflower that produces clusters of small, delicate blue flowers. Despite its diminutive size, it can quickly cover areas of your garden if left unchecked. However, its beauty and ability to attract beneficial insects like bees make it a popular addition to cottage-style gardens. Spread some forget-me-not seeds in a shaded corner of your garden and enjoy its lovely blue blooms.

My 2 Cents:

While Forget-Me-Not may be a weed in certain contexts, it has a rich history and symbolism in various cultures. Consider allowing it to grow in your garden as a reminder of loved ones or as a symbol of true and faithful love.

Blue Vervain (Verbena hastata)

Blue Vervain is a native wildflower with tall spikes of tiny blue-violet flowers. It grows in moist areas and attracts butterflies and bees. While it can be invasive, it does have medicinal properties. Blue Vervain has been used for its calming effects and as a treatment for respiratory ailments. Harvest the leaves and flowers and infuse them in tea or tinctures for a natural remedy.

My 2 Cents:

If you have a damp area in your garden where other plants struggle to grow, consider allowing Blue Vervain to take root. Its tall spikes of blue flowers will add a vertical element to your garden while supporting important pollinators.

Bird’s-Eye Speedwell (Veronica persica)

Bird’s-Eye Speedwell is a low-growing weed with small, blue or purple flowers. It spreads quickly, forming mats that can outcompete other plants. While it may be considered undesirable in manicured lawns, Bird’s-Eye Speedwell can be a useful ground cover in less formal areas of the garden. Its flowers are an important food source for bees and other early-season pollinators.

My 2 Cents:

To prevent Bird’s-Eye Speedwell from taking over your garden, regularly pull out any unwanted plants. Leave a few patches to provide early-season nectar for pollinators, but keep it in check to maintain a balanced ecosystem.

Lobelia (Lobelia spp.)

Lobelia is a diverse genus of plants that includes both ornamental cultivars and wild species. Many lobelias produce stunning blue flowers that are a magnet for hummingbirds and butterflies. Lobelia excelsa, also known as Blue Cardinal Flower, is a particularly striking species with tall spikes of deep blue flowers. Consider planting lobelias near ponds or in boggy areas of your garden to enjoy their colorful displays.

My 2 Cents:

Lobelia species, especially Blue Cardinal Flower, prefer consistently moist soil. To provide the ideal growing conditions, consider adding organic matter to retain moisture and create a fertile environment. Your lobelias will reward you with an abundance of vibrant blue flowers.

Other Weeds with Blue Flowers:

Here are some additional weeds that produce blue flowers:

– Chicory (Cichorium intybus)
– Viper’s Bugloss (Echium vulgare)
– Common Blue Violet (Viola sororia)
– Speedwell (Veronica spp.)
– Borage (Borago officinalis)
– Self-Heal (Prunella vulgaris)
– Ground Ivy (Glechoma hederacea)
– Blue-eyed Grass (Sisyrinchium spp.)
– Creeping Bellflower (Campanula rapunculoides)
– Wild Forget-Me-Not (Anchusa arvensis)
– Blue Lettuce (Lactuca biennis)
– Wild Blue Phlox (Phlox divaricata)
– Blue-Eyed Mary (Collinsia spp.)

My 2 Cents:

While these plants may be classified as weeds, they have unique qualities that can be appreciated. Consider embracing their presence in your garden and exploring their potential culinary and medicinal uses.

Tips for Managing Weeds:

1. Regularly Monitor Your Garden:

By keeping a close eye on your garden, you can identify weeds early on and take action before they become a problem. Regularly walk through your garden and inspect the plants, pulling out any unwanted weeds as you go.

2. Mulch Your Garden Beds:

Applying a layer of organic mulch around your plants will suppress weed growth by blocking sunlight and preventing weed seeds from germinating. Consider using materials like straw, wood chips, or leaves as mulch.

3. Use Natural Weed Control Methods:

If weeds become particularly problematic, there are several natural methods you can try. These include hand-pulling, smothering with cardboard or newspaper, or using vinegar or boiling water to kill weeds. Be cautious when using these methods, as they can also harm desirable plants.

4. Embrace Companion Planting:

By strategically planting companion plants, you can create a natural barrier against weeds. Plants like densely growing ground covers, such as thyme or clover, can smother weeds and reduce their growth.


Weeds with blue flowers may not be everyone’s cup of tea, but they can certainly add a touch of nature’s vibrant beauty to your garden. While some of these plants can be invasive, with proper management, they can coexist harmoniously with other desirable species. So the next time you come across a weed with blue flowers, take a moment to appreciate its unique qualities and consider how it can enrich your garden or provide valuable resources in a survival situation.

My 2 Cents:

When it comes to weeds, it’s all about striking a balance. Embrace the beauty and potential benefits these plants offer while diligently managing their growth. With a little effort and knowledge, weeds with blue flowers can become valuable additions to your garden.