What makes a plant an insectary plant? Insectary plants provide food sources and shelter for beneficial insects, which attracts them and encourages them to stick around your garden. If you’ve already read our article Pest Hunters: Beneficial Predatory and Parasitic Insects, you know that there are many beneficial insects that prey on garden pests. By planting insectary plants we can encourage these predatory and parasitic insects to take up residence in our garden. Not to mention supporting pollinators which are much appreciated garden helpers!

You might be wondering: ‘if beneficial insects eat pests, why do they need plants for food?’ In many cases it’s the beneficial insects’ larvae that prey on insect pests while the adults feed mainly on pollen and nectar. This is why many insectary plants tend to be flowers or flowering herbs. In the case of herbs, it’s important to let at least some of the plants bloom if you want to attract beneficial insects.

Keep in mind that one lonely flowering plant will not entice an army of pest hunters! Aim to plant as many insectary plants as is possible with the space you have, and be sure to plant insectary plants with different bloom times to provide pollen and nectar all season long. Also, place insectary close to the plants you want to protect. If they’re too far away from your main garden the beneficial insects may not make the trek over.

To help with incorporating insectary plants in your garden plan, we’ve compiled a list of some common insectary plants and the beneficial insects they attract:

List of insectary plants

Ammi

Scientific name: Ammi majus

In a study of insectary plants from the University of Connecticut, Ammi majus was found to attract the highest number of beneficial predatory and parasitic insect families amongst all plants studied. Ammi was also the only plant in the study that attracted two types of parasitic wasps- braconids and ichneumonids. Ammi generally blooms in spring and early summer.

Borage

Scientific name: Borago officinalis

Borage is a favored pollinator plant in the garden. It is also highly attractive to beneficial insects such as lacewings, syrphid flies, and ground beetles. Borage may even help to repel hornworms and other pests! Borage self-seeds prolifically; regular deadheading can help to encourage flowering and to reduce the amount of seeds dropped. With good care borage will bloom for most of the growing season- from June to October or longer.

California poppy

Scientific name: Eschscholzia californica

California poppies are native to the western United States and Mexico. They are highly attractive to syrphid flies and can also attract minute pirate bugs. California poppies bloom from early spring to summer, depending on the climate. In warmer areas they are perennials, but in colder climates they are grown as annuals.

Catnip

Scientific name: Nepeta cataria

Catnip does double duty when comes to pest control. Not only does it attract beneficial nectar-feeding insects such as syrphid flies, but it also produces compounds that have been shown to repel pests such as aphids, squash bugs, and others. Catnip is an extremely aggressive spreader that also self-seeds prolifically, so you’ll want to keep it contained and grow it in an area where it cannot easily self-seed. Catnip usually blooms from late spring to mid-summer; deadheading when flowers die back can help to promote new blooms and reduce seed drop.

Chamomile

Scientific name: Matricaria chamomilla

Studies have found chamomile to be highly attractive to syrphid flies as well as parasitic wasps. Chamomile may also help to attract lady beetles, lacewings, minute pirate bugs, and tachinid flies. Chamomile blooms from spring right through to fall, providing a valuable season-long food source for beneficial insects.

Cilantro

Scientific name: Coriandrum sativum

Cilantro goes to flower readily especially when warm, dry weather arrives in late spring to summer. While this can be disappointing if you’re growing cilantro for it’s leaves, it’s a boon for attracting a variety of beneficial insects such as syrphid flies, tachinid flies, parasitic wasps lacewings, lady beetles, and minute pirate bugs. Plus you can let cilantro form seeds then harvest them either to make coriander spice or to re-plant!

Dill

Scientific name: Anethum graveolens

While dill is technically a biennial it often flowers in the first season, depending on the variety and when it was planted. Dill is attractive to syrphid flies, lacewings, lady beetles, and parasitic wasps. You might also find green-black-and-yellow caterpillars on your dill plants. These are black swallowtail butterfly larvae, and while they do eat dill (and related plants) they rarely cause major damage. It’s best to leave them be!

As a bonus, dill may also have a repellent effect on aphids, cabbage loopers, squash bugs, and other pests. Plus dill readily self-seeds if the flowers are left to form seed heads!

Lavender

Scientific name: Lavandula spp.

English lavender is attractive to syrphid flies and lady beetles. Once established, lavender is a drought-tolerant plant that does not like ‘wet feet’, although it will flower best if not left to completely dry out. Lavender typically blooms from late spring to early summer. The scent of lavender, while appealing to many of us, may have a repellent effect on mosquitos, moths, and other pests.

Marigold

Scientific name: Tagetes spp.

Marigolds are a well-known beneficial garden plant, and for good reason! Marigolds are attractive to a variety of beneficial insects including lacewings, damsel bugs, big-eyed bugs, lady beetles, parasitic wasps, and minute pirate bugs. Marigolds also have many reputed pest-deterring properties, although only some of these are proven with research and the effects can vary depending on the type of marigold and how it is used. Marigolds can bloom almost all season long provided they are cared for and regularly deadheaded!

Mint

Scientific name: Mentha spp.

Mint and catnip are related and, like catnip, mint is a very aggressive spreader and self-seeder. So long as mint is contained it is a beneficial addition to the garden, attracting syrphid flies, damsel bugs, minute pirate bugs, and big-eyed bugs. Mint may also have a repellant effect on cabbage loopers and cabbage maggots. Mint usually blooms from late spring through summer; deadheading can help to encourage more blooms and reduce self-seeding.

Oregano

Scientific name: Origanum vulgare

Oregano is attractive to a variety of predatory and parasitic insects such as syrphid flies, tachinid flies, parasitic wasps lacewings, lady beetles, and minute pirate bugs. Oregano may also help to repel aphids. Oregano tends to bloom in mid-summer. The leaves are more flavorful before the plant forms flowers, but do not harvest too aggressively if you want to encourage blooms.

Parsley

Scientific name: Petroselinum crispum var. crispum, P. crispum var. neapolitanum

Parsley is attractive to syrphid flies, lady beetles, parasitic wasps, and tachinid flies, Like dill, parsley is also technically a biennial but it can flower in the first season especially if exposed to extremes of hot or cold weather. Parsley also plays host to black swallowtail butterfly larvae, sometimes called parsleyworms. While they do eat parsley, they usually do not cause major destruction especially in the home garden.

Sunflowers

Scientific name: Helianthus spp.

Sunflowers are a tall and striking addition in the vegetable garden. They are attractive to syrphid flies, parasitic wasps, lady beetles, and minute pirate bugs. Note that some speciality sunflower varieties do not produce nectar or pollen so they will not be helpful for beneficial insects (nor pollinators). Sunflowers usually bloom in late summer and early fall, providing a great late-season food source. Because sunflowers are tall and may share pests and diseases with other garden plants (more so than some of the other insectary plants), choose a location where sunflowers will not interfere with or shade out other garden plants.

Sweet alyssum

Scientific name: Lobularia maritima

Alyssum is a well-documented insectary plant that is attractive to syrphid flies, lacewings, tachinid flies, lady beetles, minute pirate bugs, and parasitic wasps. Because it is a compact, low-growing plant, alyssum can be tucked into almost any empty space in the garden to lure in beneficial insects (and to help suppress weeds and retain moisture). Alyssum can bloom from summer to fall, although it may slow down during very hot, dry weather. Keep alyssum well-watered and deadhead regularly to encourage continuous blooming.

Thyme

Scientific name: Thymus spp.

Beneficial insects tend to prefer many smaller flowers rather than individual larger flowers. Thyme, with its dainty white or pink flowers, is highly attractive to parasitic wasps, syrphid flies and other beneficial insects. Thyme can also help to repel whiteflies and cabbage moths. Thyme will typically bloom from late spring to summer. As with oregano, thyme leaves are best harvested right before the plant flowers but do not harvest too aggressively if you want to encourage bloom.

There are certainly many more insectary plants than the ones listed here! Of course there will be native plants specific to your area that can help to attract local beneficial predatory and parasitic insects to the garden. Also, research is just beginning to understand how particular garden plants can be best used for natural pest control. No matter which plants you choose, adding a variety of flowering plants in the garden is a great way to beautify the space while providing potential benefits to your edible crops!

Why Add Herbs to Your Garden

Herbs pack a major flavor punch in a dainty package and greatly enhance any dish you add them to. The price of fresh herbs at the grocery store can make you flinch - ‘do I really need fresh thyme in that dish?’ But if you have a flourishing herb garden, you will be looking for new and creative ways to use them rather than shying away! Herbs also contain vitamins and minerals and offer many health benefits.

Most herbs are quite easy to grow. They can thrive in nutrient-poor soil and some even prefer to dry out slightly! And herbs benefit your garden overall- they are great companion plants that can help ward off pests and attract beneficial insects and pollinators.

How to Select Herbs for your Garden

The first thing to consider when deciding which herbs to plant is what herbs do you like to eat? If you don’t regularly enjoy eating it, don’t bother growing it (unless you are experimenting with something new!)

Some herbs, such as mint, are perennials that can come back every year. Some perennial herbs may not be able to withstand winter in your area though, so be sure to confirm that the specific varieties you select are hardy in your growing zone. There are also herbs, such as dill, that are prolific self-seeders that will likely regrow each year.

Perennial and self-seeding herbs can be an asset in your garden if they are planted in a convenient location. Be warned, though, that some of these herbs can take over your garden if they are not contained. Bear this in mind when choosing which herbs to plant and where to plant them.

How to Plant and Care for Herbs

Some herbs can be easily started from seed, and some can even be propagated from cuttings. Others can be more tricky to grow from scratch, but buying herb plants from your local garden center still provides a great return on your investment.

Generally, herbs prefer a full-sun location and very well-draining soil. If you are growing in heavy clay soil it will need amending with compost and sand. Different herbs can have unique preferred growing conditions, however. Even though it looks enticing to plant a variety of herbs together, check their unique growing needs in Planter and avoid grouping herbs with very different needs in the same space.

You may opt to grow herbs in containers to have better control of the growing conditions. Planting herbs in containers also has the advantage of helping to control spread (except for rogue seeds!) If you do plant your herbs in containers, be sure they have drainage holes or use fabric pots that allow excess water to drain. You will need to water herbs in containers more often than if they were planted in the ground or in larger raised beds. Containers will also need extra care over the winter. Bring them into a garage or shed to help protect them, and bear in mind that perennial herbs will be less winter-hardy if they are grown in containers.

Regardless of whether you plant in-ground or in containers, it helps to have your herbs in a location that is handy to the kitchen. Otherwise you might not be inclined to go harvest them when you are in the middle of cooking!

When it comes to caring for herbs often less is more. Many herbs do not like to be overwatered and prefer to dry out between waterings, and as a general rule herbs need minimal fertilizing. There are always exceptions though, so be sure to check Planter for watering and fertilizing recommendations for the herbs you grow.

When your herbs are ready to harvest, don’t be afraid to give them a haircut! Herbs thrive with a regular trim; it helps them be more productive. Just don’t cut away more than one third of the plant at once. Check out the harvesting and storage tips in Planter to get the most out of your herbs:

Include your favorite herbs in your garden, and enjoy harvesting the freshest possible herbs right outside your door!

Why are pollinators important in the garden?

To understand why pollinators are important in the garden, we first need to understand which plants rely on them.

Self-pollinating plants, such as tomatoes and peppers, have complete flowers with both male and female parts. Pollen will fall from the male parts to the female parts with gravity and a breeze; they are not dependent on help from pollinators. Even though self-pollinating plants do not require pollinators to produce fruit, pollinators do help to ensure more complete pollination and better yields.

Wind pollinated plants, such as corn and wheat, do not need help from pollinators. Wind pollinated plants tend to be agricultural crops not as commonly grown in the home garden

Plants with incomplete flowers, such as cucumbers, squash, and melons, have separate male and female flowers. These plants depend entirely on pollinators to move the pollen from the male flowers onto the female flowers; they will not produce well if there are not sufficient pollinators around. Hand pollination is an option, and some gardeners will do this especially when saving seed, but it’s easiest to have pollinators take care of this job for you!

Some types of fruit trees and shrubs are ‘self-unfruitful’ which means they require another compatible plant of a different variety to cross-pollinate with. They cannot use their own pollen or pollen of any plant of the same variety to produce fruit and seeds. Others are ‘self-fruitful’ and can use their own pollen to produce fruit. Or, there are some that simply produce better with pollen from another variety. In all cases, pollinators play a key role in helping fruit trees and shrubs transfer pollen to produce fruit.

How to attract pollinators

Pollinators may not be there when we need them if we don’t make a safe and inviting space in the garden for them.

The first thing to consider is their habitat. Some types of bees need exposed soil to burrow in. Piles of logs, sticks, and leaves provide winter shelter, or you can buy or build “insect hotels” for this purpose. Pollinators also need a water source; ensure it is shallow with an area where they can walk up for a drink, and keep it sheltered from strong winds. Ideally avoid using pesticides, but if you are set on using them only do so when the plants are not in bloom to minimize the impact on pollinators.

Pollinators need flowers in the garden as a food source, but the types of flowers make a difference. Having a variety of native flowers with many different colors and petal shapes is very attractive to pollinators. Be aware that some ornamental flowering shrubs produce flowers that are sterile which do not provide any food for pollinators.

When planting flowers to attract pollinators, consider incorporating them directly in the veggie garden! Planting flowers amongst the vegetable plants offers many benefits. Not only can they attract pollinators, they can also attract other beneficial insects and ward off pests. Nasturtiums and borage are classic companion plants that attract pollinators, and they are also edible! Be careful not to plant invasive flowering plants such as mint in a space where you don’t want them to take over, though.

Planter has several types of flowers and flowering herbs listed and will tell you which vegetable plants pair well with them! If there is a type or variety missing, you can submit a request in Settings in Planter to have it added.

Attracting pollinators to your garden is a win-win. Help support pollinator populations and they will take care of the hard work of pollinating for you!