If you have been asking yourself “what is eating my salvias” you are not alone. This is one of the most common questions we get from gardeners in Minnesota. The frustration is real, but the fix is usually simple once you know the culprit.
Salvias are tough plants, but they are also a magnet for a few specific pests. In this guide, we will identify the likely offenders and give you a clear plan to stop the damage.
Common Culprits Behind Salvia Damage
Before you can treat the problem, you need to know who is doing the eating. Different pests leave different signs. Look closely at the leaves, stems, and the soil around the plant.
Slugs And Snails
These are the most common night-time feeders. They chew irregular holes in the middle of leaves, not the edges. You will often see a silvery slime trail on the soil or the foliage.
- They love cool, damp, shady spots.
- Damage appears overnight.
- You will rarely see them during the day.
Japanese Beetles
These beetles are easy to spot. They are metallic green and copper colored. They feed in groups, skeletonizing the leaves from the top down. The damage looks like lace has been left behind.
- They are active in the heat of the day.
- They start feeding in late June through August.
- They are most common in the Twin Cities metro area.
Spider Mites
These are not insects, but tiny arachnids. They suck the sap from the leaves, causing stippling or a dusty appearance. The leaves may turn yellow and drop off.
- They thrive in hot, dry weather.
- You may see fine webbing on the undersides of leaves.
- Damage looks like a pale, speckled pattern.
Earwigs
Earwigs are nocturnal scavengers. They chew ragged, irregular holes in the leaves. They hide in mulch, under pots, and in leaf litter during the day.
- Damage is often mistaken for slug damage.
- They do not leave a slime trail.
- You will find them hiding in damp places.
What Is Eating My Salvias: A Step-By-Step Inspection
To get a definitive answer, you need to do a quick inspection. Do this at different times of the day to catch different pests. Here is a simple method to follow.
- Check at dusk: Use a flashlight and look under the leaves. This is when slugs and earwigs come out to feed.
- Check in the morning: Look for fresh holes and slime trails. The dew makes the trails easier to see.
- Check the soil: Look for small, round holes in the ground near the base of the plant. This could indicate cutworms.
- Shake the plant: Hold a white piece of paper under a branch and shake it. If tiny specks fall and move, you have spider mites.
- Look for beetles: In the midday sun, inspect the top of the leaves for shiny beetles.
If you are still unsure, take a photo of the damage and bring it to your local garden center. They can often identify the pest instantly.
Effective Control Methods For Salvia Pests
Once you have identified the pest, you can choose the right control method. We prefer to start with the least toxic options first. This protects the beneficial insects in your garden.
Handpicking And Physical Removal
This is the most effective method for larger pests like Japanese beetles. Fill a bucket with soapy water. Knock the beetles into the bucket in the early morning when they are sluggish.
- Do this daily for a week to break the cycle.
- Drop slugs into a saltwater solution.
- Use a strong spray of water to knock off spider mites.
Organic Sprays And Drenches
For slugs, use an iron phosphate bait. This is safe for pets and wildlife. Spread it around the base of the plant in the evening.
- Use neem oil for spider mites and beetles.
- Apply insecticidal soap directly to the pests.
- Reapply after rain for best results.
Barriers And Traps
Copper tape is a great barrier for slugs. It gives them a small electric shock. Place it around pots or raised beds.
- Set out beer traps for slugs. Sink a shallow dish into the soil and fill it with beer.
- Use row covers to protect young plants from beetles.
- Place cardboard traps for earwigs. They will hide under them during the day.
Preventing Future Damage To Your Salvias
Prevention is always better than treatment. A healthy plant is more resilient to pest attacks. Here are some cultural practices that will reduce the chances of a severe infestation.
Watering Strategies
Water your salvias at the base of the plant, not from overhead. Wet foliage attracts slugs and encourages fungal diseases. Water in the morning so the leaves dry out quickly.
Clean Up Garden Debris
Remove fallen leaves and dead plant material in the fall. This eliminates hiding spots for slugs, earwigs, and beetle larvae. Keep the area around your salvias clear of mulch that is too thick.
Encourage Beneficial Insects
Plant dill, fennel, and yarrow nearby. These attract ladybugs and lacewings. These beneficial insects will prey on aphids and spider mites. Avoid broad-spectrum pesticides that kill the good bugs too.
Rotate Your Plants
If you have a severe infestation, move your salvias to a different location next year. Many pests overwinter in the soil. Rotating your plants breaks the life cycle of the pest.
When To Use Chemical Pesticides
Sometimes, organic methods are not enough. If the infestation is severe, you may need to use a chemical pesticide. Use these as a last resort and follow the label instructions exactly.
- Choose a product specifically labeled for the pest you have.
- Apply in the evening to protect bees and pollinators.
- Wear gloves and protective clothing.
- Keep children and pets off the treated area until dry.
For Japanese beetles, a systemic insecticide can be applied to the soil. The plant absorbs it, and the beetles die when they feed. This is very effective but should be used sparingly.
Understanding The Salvia Plant’s Response
Salvias are resilient. They can often recover from severe defoliation if the roots are healthy. After you control the pests, give your plants a boost.
Trim back any damaged stems. This encourages new growth. Apply a balanced, slow-release fertilizer to help the plant recover. Keep the soil consistently moist but not soggy.
Do not be alarmed if the plant looks bare for a week or two. With proper care, it will bounce back with new foliage. The key is to act quickly and stay consistent with your pest control efforts.
Seasonal Pest Activity In Minnesota
Minnesota’s short growing season means timing your fertilizer applications around Memorial Day and Labor Day for optimal results. The same timing applies to pest control. Different pests are active at different times of the year.
- Spring: Slugs and cutworms are most active in the cool, wet weather.
- Early Summer: Aphids and spider mites start to appear as temperatures rise.
- Mid-Summer: Japanese beetles are at their peak in July.
- Late Summer: Earwigs and spider mites can be problematic during dry spells.
By knowing the seasonal patterns, you can apply preventative treatments before the pests arrive. This is much more effective than reacting to the damage after it occurs.
Frequently Asked Questions
Why Are There Holes In My Salvia Leaves But No Bugs Visible?
This is usually caused by slugs or earwigs that feed at night. Check the plant with a flashlight after dark. You will likely find the culprits hiding under the leaves or in the soil.
Will Salvias Regrow After Being Eaten By Pests?
Yes, most salvias will regrow if the roots are healthy. Cut back the damaged stems and provide consistent water. The plant will produce new growth within a few weeks.
Are There Any Salvia Varieties That Are Pest-resistant?
Some varieties with thicker, fuzzy leaves are less attractive to pests. Look for Salvia nemorosa varieties. They tend to be more resistant to Japanese beetles than the thin-leaved annual types.
Can I use dish soap to get rid of pests on my salvias?
Yes, a mild solution of dish soap and water can work for soft-bodied insects like aphids and spider mites. Mix one tablespoon of mild soap per quart of water. Test it on a small area first to make sure it does not burn the leaves.
How Do I Stop Deer From Eating My Salvias?
Deer usually avoid salvias because of the strong scent and fuzzy texture. If deer are eating them, it is likely a very hungry deer. Use a commercial deer repellent spray and reapply it after rain.
Final Thoughts On Protecting Your Salvias
Identifying the pest is the hardest part. Once you know what you are dealing with, the solution is usually straightforward. Start with the least toxic methods and escalate only if needed.
Keep a close eye on your plants. Check them every few days during the growing season. Early detection is the key to preventing a small problem from becoming a large one.
Remember that a little bit of damage is normal and acceptable. Do not panic if you see a few holes. The goal is to keep the plant healthy and thriving, not to have a perfect, untouched specimen.
With these strategies, you can win the battle against the pests and enjoy your salvias all season long. The plants are tough, and with a little help from you, they will put on a beautiful show of color.
Take a deep breath and go check your plants. You now have the knowledge to identify the problem and the tools to fix it. Your salvias will thank you for it.