Verbena plants thrive when their specific nutritional needs are met through targeted fertilization, and finding the best verbena fertilizers can make the difference between a sparse plant and a cascade of vibrant blooms. These sun-loving annuals and perennials are heavy feeders during their growing season, but they are also sensitive to over-fertilization. The right fertilizer will encourage continuous flowering, strong root development, and healthy green foliage without causing leggy growth or burnt roots.
In this guide, you will learn exactly what verbena needs, when to feed it, and which products deliver the best results. We cover liquid, granular, slow-release, and organic options so you can choose what fits your gardening style.
Best Verbena Fertilizers
When you search for the best verbena fertilizers, you will find many products claiming to be perfect for flowering plants. However, not all fertilizers are created equal. Verbena has a few specific requirements that set it apart from other annuals. It needs a balanced ratio of nitrogen, phosphorus, and potassium, with a slight emphasis on phosphorus to support bud formation and blooming. Too much nitrogen will push leaf growth at the expense of flowers, making the plant look lush but bloom poorly.
Another key factor is the form of the fertilizer. Verbena responds well to both liquid and granular options, but the timing and application method matter a lot. Liquid fertilizers are absorbed quickly and are great for giving a quick boost during the growing season. Granular slow-release formulas provide a steady supply of nutrients over several weeks, which is ideal for busy gardeners who do not want to feed every week.
Below we break down the top choices, how to use them, and what to avoid.
Liquid Fertilizers For Verbena
Liquid fertilizers are the most popular choice for verbena because they deliver nutrients directly to the roots and leaves. They are easy to mix with water and apply during regular watering. The key is to use a balanced formula, such as a 10-10-10 or a bloom booster like 5-10-5, and dilute it to half strength to prevent root burn.
One of the best liquid options is a water-soluble fertilizer designed for flowering plants. Look for products that contain micronutrients like iron and magnesium, which help keep verbena foliage dark green and prevent yellowing. Apply every two weeks during the active growing season, from spring through early fall. Stop feeding about six weeks before the first expected frost to allow the plant to slow down naturally.
If you are growing verbena in containers, liquid fertilizers are especially effective because nutrients leach out of the soil faster with frequent watering. You may need to feed weekly at half strength for potted verbena.
Top Liquid Fertilizer Recommendations
- Miracle-Gro Water Soluble All Purpose Plant Food (24-8-16) – Use at half strength every two weeks
- Jack’s Classic Blossom Booster (10-30-20) – High phosphorus for maximum blooms
- Espoma Liquid Flower-tone (2-5-3) – Organic option with beneficial microbes
- FoxFarm Big Bloom Liquid Concentrate (0.01-0.3-0.7) – Gentle, organic, and great for sensitive plants
Granular Slow-Release Fertilizers
Granular slow-release fertilizers are a set-and-forget option for verbena beds and borders. You sprinkle the granules on the soil surface around the plant, then water them in. The nutrients release gradually over several weeks, providing a consistent supply without the risk of overfeeding. This is particularly useful for verbena planted in garden beds where you cannot water as frequently.
When choosing a granular fertilizer, look for one with a balanced N-P-K ratio like 14-14-14 or 10-10-10. Avoid high-nitrogen lawn fertilizers, as they will cause verbena to produce excessive leaves and few flowers. Apply once at planting time and again in midsummer if the plants are still actively growing.
One advantage of granular fertilizers is that they are less likely to cause salt buildup in the soil, which can be a problem with liquid feeds in containers. However, they take longer to work, so you will not see immediate results.
Top Granular Fertilizer Recommendations
- Osmocote Smart-Release Plant Food (14-14-14) – Reliable, long-lasting, and easy to use
- Espoma Plant-tone (5-3-3) – Organic granular with added bio-tone microbes
- Jobe’s Organics All Purpose Fertilizer (4-4-4) – Slow-release and safe for edibles nearby
- Dr. Earth Flower Girl Bud & Bloom (3-9-4) – High phosphorus for heavy bloomers
Organic Fertilizer Options
Organic fertilizers are an excellent choice if you prefer natural gardening methods. They improve soil structure and feed beneficial microorganisms, which in turn help verbena absorb nutrients more efficiently. Organic options are typically lower in concentration, so they are harder to over-apply. However, they break down slowly and may not provide the immediate boost that liquid synthetics offer.
Compost tea is a fantastic organic liquid feed for verbena. You can brew your own by steeping compost in water for 24 to 48 hours, then strain and apply. It provides a wide range of micronutrients and beneficial bacteria. Another option is fish emulsion, which is high in nitrogen but should be used sparingly to avoid excessive leaf growth.
Bone meal is a good source of phosphorus and calcium, which support root development and flower formation. Mix it into the soil at planting time. Kelp meal provides potassium and trace minerals, helping verbena resist stress and disease.
Top Organic Fertilizer Recommendations
- Neptune’s Harvest Fish & Seaweed Fertilizer (2-3-1) – Liquid, gentle, and nutrient-rich
- Down To Earth All Purpose Fertilizer (4-6-2) – Granular, organic, and balanced
- Worm castings – Top dress or mix into soil for slow-release nutrients
- Espoma Kelp Meal (1-0-2) – Add to soil or use as a foliar spray
When To Fertilize Verbena
Timing is everything when it comes to feeding verbena. Start fertilizing about two weeks after planting, once the plants have settled in and begun to grow. For seedlings or transplants, wait until you see new growth before applying any fertilizer. This prevents shocking the young roots.
During the active growing season, which runs from late spring through early fall, feed every two to three weeks with a liquid fertilizer or follow the instructions on your slow-release product. If you are using a granular slow-release formula, one application at planting and one in midsummer is usually enough.
Reduce fertilization in late summer as the days shorten and temperatures cool. Verbena naturally slows down its growth, and continued feeding can lead to soft, tender growth that is vulnerable to frost damage. Stop fertilizing completely by early fall.
How To Apply Fertilizer To Verbena
Applying fertilizer correctly is just as important as choosing the right product. Here are step-by-step instructions for both liquid and granular methods.
- For liquid fertilizers: Mix the fertilizer with water according to the package instructions, but dilute it to half strength for verbena. Water the soil around the base of the plant until the solution runs out of the drainage holes. Avoid getting the fertilizer on the leaves, as it can cause burn spots. Apply in the morning or evening when the sun is not intense.
- For granular fertilizers: Measure the recommended amount and sprinkle it evenly on the soil surface around the plant, keeping it a few inches away from the stem. Gently scratch the granules into the top inch of soil with a hand cultivator. Water thoroughly to help the granules dissolve and carry nutrients down to the roots.
- For organic amendments: Mix bone meal, kelp meal, or worm castings into the soil at planting time. For established plants, top dress by spreading a thin layer of compost or worm castings around the base, then water in.
Always water your verbena before applying fertilizer, especially if the soil is dry. Fertilizing dry soil can burn the roots. After feeding, water again lightly to help distribute the nutrients.
Common Fertilizing Mistakes To Avoid
Even with the best verbena fertilizers, mistakes can happen. Here are the most common errors and how to avoid them.
- Over-fertilizing: Too much fertilizer, especially nitrogen, causes leggy growth and few flowers. It can also burn the roots. Always follow the recommended dosage and dilute to half strength for liquid feeds.
- Under-fertilizing: Verbena is a heavy feeder, especially in containers. If the leaves turn pale yellow or the plant stops blooming, it may need more nutrients. Increase feeding frequency slightly.
- Fertilizing at the wrong time: Feeding verbena in late fall or winter encourages weak growth that cannot survive cold weather. Stick to the active growing season.
- Using the wrong ratio: A high-nitrogen fertilizer, such as lawn food, will produce lots of leaves but few flowers. Stick to balanced or bloom-boosting formulas.
- Applying to dry soil: Always water before and after fertilizing to prevent root burn and ensure even distribution.
Signs Your Verbena Needs Fertilizer
Your verbena will tell you when it is hungry. Look for these signs to know when to feed.
- Pale or yellowing leaves, especially the lower ones
- Stunted growth or small leaves
- Fewer flowers than expected, or flowers that are small and short-lived
- Leaves that curl or drop prematurely
- Overall weak, spindly appearance
If you notice any of these symptoms, check the soil moisture first. Sometimes yellowing is caused by overwatering or poor drainage, not lack of fertilizer. Once you rule out water issues, a balanced liquid feed should green up the plant within a week.
Fertilizing Verbena In Containers Vs. Garden Beds
Verbena grown in containers has different nutritional needs than those planted in the ground. Container soil warms up faster and dries out quicker, which means nutrients are depleted faster. You will need to fertilize container verbena more often, typically every week to two weeks at half strength.
Garden bed verbena benefits from the natural nutrients in the soil, especially if you amended the bed with compost before planting. You can get away with feeding every three to four weeks with a liquid fertilizer, or use a slow-release granular at planting and again in midsummer.
Another difference is that container verbena is more susceptible to salt buildup from synthetic fertilizers. To prevent this, flush the pot with plain water every few weeks until water runs out of the drainage holes. This leaches out excess salts.
Frequently Asked Questions About Verbena Fertilizers
Can I use tomato fertilizer on verbena?
Yes, tomato fertilizers are often high in phosphorus, which promotes blooming. They work well for verbena, but be careful not to overdo it. Use at half strength to avoid nitrogen overload.
Is it better to use liquid or granular fertilizer for verbena?
Both work, but liquid fertilizers are faster acting and better for container plants. Granular slow-release formulas are convenient for garden beds and require less frequent application.
How often should I fertilize verbena in hanging baskets?
Hanging baskets dry out quickly and need frequent feeding. Fertilize every week with a half-strength liquid fertilizer during the growing season. Water with plain water once a month to flush salts.
Can I fertilize verbena with Epsom salt?
Epsom salt provides magnesium, which can help green up leaves if the plant is deficient. However, it is not a complete fertilizer. Use it sparingly, once a month, as a supplement to your regular feeding routine.
What is the best N-P-K ratio for verbena?
A balanced ratio like 10-10-10 or a bloom booster like 5-10-5 works best. Avoid high-nitrogen formulas. The phosphorus (middle number) should be equal to or higher than nitrogen.
Choosing the best verbena fertilizers does not have to be complicated. Stick with balanced formulas, apply at the right time, and watch your plants respond with vigorous growth and non-stop color. Whether you prefer liquid, granular, or organic, the key is consistency and moderation. Feed your verbena well, and it will reward you with a stunning display all season long.