Though fertilizing is a relatively simple and straightforward process, the kind of plant you’re working with can make things a little more complicated.
For some flowering plants, you just need to fertilize them every so often and forget about it, whereas others might demand extra care or caution.
In today’s article, we’re going to dive deep into the world of petunias and figure out what fertilization methods can help you achieve continuous blooms all season round. Let’s dig into it, shall we?
Why Fertilizing Petunias Really Matters?
Now, I’m sure you might be thinking, “Ughh…does fertilizing petunias even matter?” Yes…it absolutely does!
Fortunately or unfortunately, petunias are one of those plants that need consistent feeding to grow well and flower to their fullest potential.
If you didn’t already know, they’re heavy bloomers and need constant energy to keep flowering. The only way for them to achieve that energy is through essential nutrients, like in a fertilizer.
Like with hydrangeas, fertilizing petunias can bring a massive visual change and boost their longevity. You want to prioritize fertilization if you want healthy, vibrant petunias.
These Are The Best Types of Fertilizer For Petunias
Slow-Release Fertilizer
A slow-release fertilizer is best for raised beds or hanging baskets. You want to apply this one at the time of planting, as it feeds steadily for weeks on end.
The best thing about slow-release fertilizers is that they allow you to reduce feeding frequency, which is helpful if you have a busy life or are going away and won’t be able to make regular feedings for a while.
Liquid Or Water-Soluble Fertilizer
A liquid or water-soluble fertilizer is the ideal choice for weekly or biweekly feeding. It brings immediate results and works best during the active blooming stage.
Quick tip: Read the manufacturer’s instructions on the liquid fertilizer label to figure out how much to use and ideal dilution ratios. DO NOT eyeball it, as it will put your petunias at risk of overfertilization and long-term root damage.
Balanced Or Bloom-Boosting NPK Ratios
When searching for the ideal fertilizer, look for one with an NPK of 10-10-10 or 10-30-20. A higher phosphorus content will result in more flowers, whereas a higher nitrogen concentration will promote more leafy growth.
Miracle-Gro and Espoma are two of my most favorite fertilizer brands as they provide access to quality, specialized fertilizer formulas.
How Often Should You Fertilize Petunias?
Note: Petunias growing in raised beds will have slightly different fertilization needs compared to petunias growing in pots.
In Containers Or Hanging Baskets
Feed your petunias in containers or hanging baskets every 7-10 days with a diluted liquid fertilizer. Ensure dilution, as regular liquid fertilizers are typically very concentrated and can easily burn roots.
You might also want to water more often here due to faster nutrient leaching.
In Raised Beds Or Garden Soil
When planting in raised beds or simple garden soil, use a slow-release formula and supplement with a liquid-based fertilizer every 2-3 weeks. This will ensure proper nutrient uptake and rich soil, which is able to support vibrant petunia blooms.
Quick Seasonal Timing Tips
Signs Your Petunias Need More (Or Less) Fertilizer
They need more if…
You’re overdoing it if…
Let’s Conclude
Like I said, the actual process of fertilizing itself isn’t that complex or challenging. However, knowing your fertilizers and when they work best is an advantage that’s difficult to acquire, but can pay off massively throughout the course of your gardening journey.
Today, we discussed all the different fertilizer varieties that you can use to promote continuous blooming in your petunias. Now, it’s time for you to make the right choice according to your circumstances and unlock a new level of growth and blooming for your petunias. Good luck!
