In brief: Bee decline has several main causes: the loss of natural habitats, the widespread use of insecticides, parasites such as the varroa mite, and monocultures. You can help protect bees by avoiding pesticides that harm them, planting native flowers, and providing nesting sites. Ecological gardening creates lasting sources of food and shelter.
Bee Decline: Causes & How to Protect Bees in Your Garden
Bees are essential. They pollinate most of our crops and wild plants, so their decline threatens biodiversity and our food supply. The good news is that your garden can become a safe haven. Learn what causes bee decline and which steps can help protect bees.
Important note
Do not use synthetic chemical insecticides or broad-spectrum herbicides such as glyphosate in your garden. These chemicals do not just kill pests; they can also harm or kill bees and other beneficial insects over time. The plant protection products you choose have a major impact on the health of your garden ecosystem.
What are the main causes of bee decline?
The problem is complex. The decline of honeybee colonies and wild bee species is not caused by a single factor, but by the interaction of several factors.
Loss of habitat and food sources
Paved surfaces, intensive farming, and overly tidy gardens reduce the availability of nesting sites and flower-rich meadows. Monocultures provide food for only a short time, leaving bees with a shortage afterward.
The use of pesticides
Insecticides from the neonicotinoid group work systemically. Plants absorb them, and the pesticides can end up in pollen and nectar. Bees take them in and carry them back to their hives. The consequences can include disorientation, a weakened immune system, and death.
“The widespread use of pesticides in agricultural landscapes is one of the major causes of insect decline. Gardens can play an important counterbalancing role as pesticide-free refuges.”
Parasites and diseases
The varroa mite severely weakens honeybee colonies. It transmits viruses and feeds on the brood. Without treatment by beekeepers, affected colonies die. Introduced parasites can also threaten wild bees.
Climate change and extreme weather
Drought, late frosts, and unusually warm winters disrupt the natural rhythms of plants and bees. Flowers bloom earlier, before the bees are active. Their timing falls out of sync.
How can I create a bee-friendly garden?
Ecological gardening takes the cycles and communities of living things into account. The goal is not a flawless ornamental garden, but a vibrant, diverse space. Every step helps.
Choosing the right plants
Choose native flowering plants and perennials. They often provide more nectar and pollen than highly bred ornamental plants with double flowers, which offer little value to bees. Plan for flowers to bloom from March to October.
- Spring: Willow catkins, crocuses, lungwort, blackthorn
- Summer: Lavender, sage, thyme, phacelia (bee-friendly)
- Fall: Ivy, asters, sedum
Create a wildflower meadow or mow your lawn less often. Clover, daisies, and dandelions are important food sources. In the Garden + Outdoor section, you will find suitable seeds.
Expert tip
Plant in groups. Bees tend to forage on one plant species at a time and prefer to visit several flowers of the same type in a row. One square meter of bellflowers is more attractive than ten individual plants scattered throughout the garden. This saves bees energy.
Avoiding chemicals
This is the most important step toward ecological gardening. Control pests with mechanical methods, by encouraging beneficial insects, or with biological products. Aphids can often be washed away with a strong stream of water or controlled by introducing ladybug larvae.
For clean cuts when deadheading perennials or pruning shrubs, sharp are ideal. They prevent crushing, which can let diseases enter the plant, without using pesticides.
“Every garden owner can create a pesticide-free zone in their few hundred square meters. Across Germany, these areas add up to a huge network of safe habitats.”
Providing water
Bees need water to drink and to cool their hives. Set out a shallow dish of water with a few stones or marbles for landing spots. This helps prevent bees from drowning. A garden irrigation system with a soaker hose can also create damp areas.
What nesting aids do wild bees need?
Only around 10% of native wild bee species live in colonies like honeybees. More than 90% are solitary, meaning they live alone. They need specific nesting sites.
Open ground and deadwood
Many species nest in the ground. Leave sunny, bare areas of sand or clay undisturbed. A pile of deadwood or pithy stems from blackberry or mullein can also provide ideal nesting tubes. Do not clear everything away. In the garden tools range, you will find equipment for gentle garden care.
Buying or building an insect hotel
Pay attention to quality. Good options include hardwood blocks with cleanly drilled holes in various diameters, 2-10 mm, or bundles of reed and bamboo tubes with smooth, cut ends. Hang the hotel in a sunny spot protected from rain and wind. Avoid cheap models with glass tubes, straw, or pine cones.
Additional advice
Do not clean an insect hotel. Bees often reuse old nesting tubes the following year, or the tubes may shelter overwintering offspring. A “tidy” hotel is worthless. Let nature take its course inside.
Rock piles and dry-stone walls
They store heat and provide perfect hiding places in their gaps. A dry-stone wall made of natural stones without mortar is a living habitat for many insects, lizards, and plants.
How can I protect bees from other dangers?
Besides pesticides, gardens often contain overlooked sources of danger.
Take care when mowing and pruning
Mow sections of meadow in stages, never all at once. This ensures there are always places to find shelter and food. Before cutting bushes or perennials, check whether bees are active there.
Transparent obstacles
Bees do not recognize large glass surfaces on sunrooms or greenhouses as obstacles. Mark them with stickers or patterns. Rain barrels without an escape route can also become deadly traps. Cover them or place a wooden stick inside.
Avoiding light pollution
Bright artificial light at night disorients nocturnal insects and can lead them off course. Use dim, warm-white lighting in the garden and turn it off at night.
Conclusion: Every Garden Matters
Bee decline is a human-caused problem, and the solution starts right outside your door. By avoiding pesticides, planting native species, and letting natural features develop, you can create a resilient ecosystem. Your bee-friendly garden becomes a stepping stone in a connected network of habitats. It improves life not only for bees, but also for butterflies, birds, and you. Start today with one small bee-friendly area. Nature will thank you.
Frequently Asked Questions
- Which insecticides are especially harmful to bees?
- Systemic insecticides in the neonicotinoid group are especially harmful. Plants absorb them, and they can end up in pollen and nectar. Certain pyrethroids and organophosphates can also cause acute harm to bees. Avoid synthetic chemical pesticides in your home garden.
- When do the most important plants for bees bloom?
- Bees need food from early spring through late fall. Important plants include early bloomers such as willow and crocus, summer flowers such as lavender and phacelia, and fall bloomers such as ivy and asters. Plan for a continuous succession of blooms with native plants.
- Can I build a bee hotel myself?
- Yes. Use hardwood blocks with cleanly drilled holes (2-10 mm in diameter) or bundles of pithy stems. Make sure there are no sharp or splintered edges. Hang the bee hotel in a sunny spot protected from rain and wind. Avoid store-bought models with glass tubes or unsuitable materials.
- Does a closely mown lawn harm bees?
- A closely mown, species-poor lawn provides bees with neither food nor habitat. It is an ecological desert. Instead, leave areas with clover, daisies and dandelions, or mow in sections. A wildflower meadow is the best alternative.
- How can I tell if a bee is injured or weak?
- A bee crawling on the ground, unable to fly or barely moving is often weakened. In a sheltered spot, offer it a solution of lukewarm water and a little sugar or honey. Once it has recovered, carefully place it on a flower.
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- Bee-Friendly Garden: How to Help Our Pollinators
- Insect Decline in the Garden: Causes and What You Can Do Right Now
- Solitary Bees in the Garden: Create and Protect Their Habitat
- Garden for Biodiversity: Encourage Insects and Abundant Blooms
- Bee-Friendly Balcony Plants: How to Support Biodiversity in a Small Space
- Wasps in the Garden: Causes and Effective Strategies