How to Choose the Best Fertilizer for Healthy Rose Plants?

Rose plants need continuous fertilisation throughout their growth to remain healthy. These delicate flowers are heavy feeders and need to be fed with high-quality fertiliser to bloom better and deter insects and diseases. However, it is important to note that roses are very picky, so understanding which fertiliser to use is essential for optimal growth.

This blog discusses the best fertiliser for rose plants so that you have a garden full of healthy, beautiful, and bright roses.

When Should You Fertilizer Roses?

Experts recommend fertilising roses in early spring when they start leafing out. However, before you fertilise, wait until you see about 6 inches of new growth. Continue feeding the fertilisers to your roses throughout the growing season and stop feeding them in late summer or early fall.

Feeding them during early fall can trigger tender new growth, which may get damaged by cold snaps during the fall. Such damaged growth is more prone to pest infestation.

When to fertilise the roses depends on the -

• Type and Age of the Rose Plant: Tea roses require more nutrients than shrub roses.

• Blooming Pattern: If the rose plant blooms repeatedly, it may need frequent fertilisation.

What Nutrients Do Roses Need?

Like any other plant, roses also need macronutrients, such as phosphorus, nitrogen, and potassium. Here’s detailed information on the nutrients roses need -

Nitrogen

Nitrogen helps in the growth of new leaves, and as roses develop flowers with their leaves, it becomes important to keep the foliage healthy. However, it should be noted that you don’t overfeed the plant with nitrogen, as it might result in too many leaves and fewer blooms. On the other hand, underfeeding nitrogen may cause the leaves to turn yellow, stunt the growth of the plants, and lead to smaller flowers.

Phosphorus

Phosphorus keeps the roots healthy and helps in flower production. If there’s a shortage of phosphorus in the rose diet, then it can result in leaf drop, fragile flower stems, and buds that do not bloom.

Potassium

Potassium, also referred to as potash, helps roses recover from pest infestation and damage due to disease and extreme weather conditions. If there's little to no potassium in the fertiliser,  leaves may turn yellow, the stems grow weak and fragile, and buds won’t bloom at all.

In addition to the macronutrients, your rose plants also need calcium, magnesium, boron, copper, sulphur, iron, zinc, and manganese for optimal growth.

What Are the Best Fertilizers for Roses?

There are two types of fertilisers that you must feed your rose plant with -

Organic Fertilizers

Here’s a list of organic fertilisers that your roses need -

• Aged or Composted Manure: First, never use fresh manure, as it contains a high amount of nitrogen. Even when you use aged manure, apply it 2-3 inches deep into the soil for better NPK fertilisation.

• Bone Meal: Using bone meal is beneficial as it adds phosphorus to the soil. Mix it deeply into the soil to repel wild animals from coming near the plant, or dig the soil up.

• Dried Blood Meal: Apply a tablespoon of dried blood meal around the plant for nitrogen. But avoid using too much fertiliser, as it might burn the roots.

• Greensand: This adds potassium and micronutrients.

• Liquid Fish Fertilisers: Read the product label and dilute some of the fertilizer to water, as instructed. This releases a quick organic source of nitrogen.

• Rock Phosphate: This offers calcium, phosphorus, and micronutrients to the soil.

• Alfalfa Meal: This is an additive used for balanced fertilisers.

• Seaweed: This provides nitrogen and phosphate to the soil.

• Ground Coffee: Sprinkle coffee grounds at the base of the plant, as it gives the roses a boost in nitrogen.

Inorganic Fertilizers

Inorganic fertilisers are made from synthetic chemicals. They are more concentrated and may cause burning if applied too much on dry soil. Hence, it is advised to apply these fertilisers in thin and even layers around the plant, on the damp soil. You can apply the fertiliser before watering and ensure to keep it away from canes and the graft union. Also, once you apply the fertiliser, do not forget to water it.

Rose plants with higher phosphorus requirements have special food customised for them, with an NPK ratio, where the second number, that is, phosphorus, is always at the highest. You can also use general complete fertilisers with a phosphorus ratio of 5-10-5, 4,8-4, or 4-12-4. Or, you can use plant food with fertiliser numbers 6-12-6, as this contains 24% total nutrients and 76% of filler materials.

How to Fertilize Roses?

Newly Planted Roses

Here’s how to fertilise newly planted roses in your garden -

• When planting, enrich the soil in the hole with organic matter to provide a nutrient-dense foundation to support healthy rose growth.

• Start fertilising new roses about one month after planting, when they start showing some fresh growth. This indicates that they have started to establish themselves.

• Gently include a high-phosphorus, slow-release fertiliser. But before using any fertiliser, read the instructions carefully. Also, you can combine it with bone meal, which helps in root development.

• Keep applying fertiliser every 3-4 weeks while the roses are establishing, and it is advised to use only a gentle fertiliser like fish emulsion to avoid stressing young roots.

Established Roses

Here’s how to fertilise already established roses -

• It is better to fertilise the roses during early spring when they start to come out, and you don’t even have to worry about the spring frost. Use a high-nitrogen or balanced fertiliser and apply whenever you see new leaves emerging.

• You should fertilise in every bloom cycle (around 1-2 times per month), and reduce the amount of fertiliser by half every time. Before 6-8 weeks of the arrival of the first average frost date, stop applying fertilisers. This prevents the plant from producing new growth in the late summer, which may be susceptible to damage due to cold when the fall arrives.

• Once they have gone dormant, fertilise them again, as this prepares them for the next spring.

Container Roses

Here’s how to fertilise container roses -

• When planting the rose into a container, add a slow-release granular rose fertiliser into the potting soil. Also, add some bone meal to make sure the roots grow healthy.

• After the first year, feed established container roses every 4-6 weeks during the growing season. Use water-soluble or slow-release fertiliser that is especially meant for container plants.

• Also, check for the yellowing leaves, as it indicates a nutrition deficiency, which means you need to feed them with more fertilisers.

Tips for Effective Fertilization

Here are some essential tips on how you can apply fertilisation for a beautiful and vibrant rose garden -

• First, prep your garden before feeding fertiliser. Remove the dried leaves, sticks, weeds, and other debris that may be lying around. This helps the roots to absorb the nutrients effectively.

• Next, apply fertilisers early in the season so that it grows properly throughout the growing season. You can use liquid seaweed to support the rose plant's growth.

• Lastly, remember not to overfeed. Read the guidelines given on the product packaging before using, as overfeeding always does more harm than good.

Conclusion

The best fertiliser for your rose plant depends on the type of soil, and many experts advise getting the soil tested before you apply fertilisers to it. You can use fish emulsion, compost manure, seaweed, coffee grounds, and many more to make sure your rose plant is flourishing all through the growing season.