Hollyhocks are popular garden plants, known for their towering spires of vibrant blooms. They are a common sight in cottage gardens, often planted along fences or walls. Companion planting involves strategically placing different plant species near each other to improve their growth, health, or overall garden productivity, creating a more resilient and thriving ecosystem.
Why Companion Planting Benefits Hollyhocks
Companion planting offers several advantages for hollyhocks. One significant benefit is natural pest deterrence. Hollyhocks are susceptible to common pests and diseases like rust fungus, powdery mildew, aphids, spider mites, and Japanese beetles. Certain companion plants can release compounds that repel these issues, reducing the need for chemical interventions.
Another advantage is the attraction of beneficial insects. Some companion plants draw in pollinators. These beneficial insects also include natural predators of common hollyhock pests. Companion planting can also improve soil health by contributing to nitrogen fixation, enhancing soil structure, and suppressing weeds. Taller hollyhocks can provide shade for smaller, more sensitive plants, maximizing garden space and creating a balanced microclimate.
Ideal Companion Plants for Hollyhocks
Selecting the right companion plants can significantly enhance the health and aesthetic appeal of your hollyhocks.
Herbs
Herbs offer benefits when planted near hollyhocks. Basil, with its strong aroma, can deter pests. It also attracts pollinators and, being a low-growing plant, can benefit from the shade provided by taller hollyhocks without competing for space. Lavender’s potent scent repels pests. Lavender is also drought-tolerant and shares similar growing conditions with hollyhocks, thriving in full sun and well-drained soil.
Alliums are effective companions. Their strong scent can deter a variety of insect pests and may even deter rodents. Mint is beneficial for deterring deer and rabbits, but its aggressive spreading habit requires it to be planted in containers to prevent it from outcompeting hollyhocks.
Flowering Plants
Flowering plants serve as effective companions for hollyhocks, offering both pest control and visual appeal. Marigolds deter pests. Their scent is off-putting to many harmful insects, and they also attract beneficial insects. Nasturtiums can act as a trap crop for aphids, drawing them away from hollyhocks, and they also deter various pests.
Borage is a versatile companion plant that deters pests and is highly attractive to pollinators. Foxgloves, like hollyhocks, are tall, stately plants that share similar sun and soil requirements. Their tubular flowers attract pollinators. Cosmos and zinnias are annuals that add contrasting color and texture, and they attract pollinators.
Vegetables
Vegetables can also be good neighbors for hollyhocks, providing mutual benefits. Beans can be beneficial as they fix nitrogen in the soil. Corn can provide physical support and shade for climbing plants. However, some sources recommend avoiding beans due to their high nitrogen requirement and potential to attract aphids.
Plants to Avoid Near Hollyhocks
Certain plants can negatively impact hollyhocks and should be avoided. Plants in the mallow family (Malvaceae) should not be planted near hollyhocks. These related plants are susceptible to the same diseases, particularly hollyhock rust, which can easily spread between them and create a disease hotspot in the garden.
Aggressive spreaders, like mint, can quickly overtake hollyhocks and compete for resources, hindering their growth. Tomatoes are also not ideal companions because they are prone to pests. Additionally, tomatoes have higher water requirements than hollyhocks, leading to competition for soil moisture. Plants that attract Japanese beetles should also be avoided.
Tips for Successful Hollyhock Companion Planting
Successful companion planting for hollyhocks involves careful planning and ongoing observation. Proper spacing is a primary consideration, as hollyhocks can grow quite tall, reaching up to 6-8 feet. Allowing adequate space ensures good air circulation, preventing fungal diseases. Good air circulation helps keep foliage dry.
Understanding sun exposure requirements is also important. Hollyhocks prefer full sun for optimal flowering. Companion plants should also share this preference. Soil compatibility is another factor; hollyhocks thrive in well-draining, fertile soil. Enriching the soil with compost can benefit both hollyhocks and their companions.
Regular monitoring of plant health is essential for successful companion planting. Keep an eye out for signs of pests or diseases on all plants, allowing for early intervention. This proactive approach helps maintain a balanced garden ecosystem. Adjusting watering and fertilizing routines based on the combined needs of the plants further supports their growth.