Do you just stick these by the base of the bush? How long do they last?

Yes you will want to stick it near the base of the bush. They seemed to last about 4-6 weeks on my plants. And my roses have never done better.

can it be used for rose of sharon

They are not quite the same type of plant. Jobes makes an all-purpose spike, which is what the rose of sharon is supposed to get. I wouldn't over fertilize either, since it will promote new growth, but not necessarily blooms. Now is a good time, early spring.

Can this be applied with the initial Spring fertilizer timeline of roses, or should it be used separately (later)?

You can use in spring by itself . . .I would not recommend combining with additional fertilizer. The stakes are large and depending on the size of the roses, you use more than one for each bush.

Do these work on knock out roses?

I feed my Knockouts 10 10 10 and they look fantastic. I use the Jobe's spikes on my hybrid roses and climbers. I feel sure the knockouts would also love them.

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Rose Fertilizer Spikes, Easy Plant Care Plant Fertilizer for Rose, Hydrangea, Hibiscus, Azalea, and Other Flowering Shrubs, 10 Count

Product ID: 256680419

Details

Brand
Jobe's
Global Trade Identification Number
Item form
Sticks
Item weight
0.45 Pounds
Specific uses for product
Flowering

⏳Feeds plants for 8 weeks

🌿9-12-9 NPK nutrient balance

🔒Pre-measured, no over-fertilizing

$51.69

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Description

🌹 Bloom Boldly, Feed Smartly!

EFFORTLESS 8 WEEK FEEDING - Set it and forget it—continuous root nourishment for two full months keeps your garden thriving.
MESS FREE SAFE APPLICATION - No spills, no smells, and safe around kids and pets—garden care without the hassle.
ECO FRIENDLY WASTE REDUCING - Designed to prevent runoff and waste, making your green thumb greener for the planet.
PRECISION NUTRITION FOR VIBRANT BLOOMS - Pre-measured spikes deliver the perfect 9-12-9 NPK formula to fuel lush roses and flowering shrubs.
VERSATILE FOR MULTIPLE FLOWERING PLANTS - Ideal for roses, hydrangeas, hibiscus, azaleas, and more—one solution for a colorful garden.

Jobe's Organics Rose Fertilizer Spikes provide a precise 9-12-9 nutrient formula in pre-measured spikes that feed flowering plants like roses and shrubs for 8 weeks. Designed for easy, mess-free application, these spikes nourish roots directly while preventing runoff and over-fertilizing. Safe for children and pets, they support vibrant blooms and lush foliage across a variety of flowering plants.

Specifications

ASIN	B0000BYCPP
Brand Name	Jobe's Organics
Coverage	Medium
Customer Reviews	4.6 4.6 out of 5 stars (3,337)
Global Trade Identification Number	00073035040020
Item Form	Sticks
Item Type Name	Rose
Item Weight	0.45 Pounds
Manufacturer	Jobe's
Mixing Ratio	9-12-9
Model Number	04102
Number of Items	1
Part Number	4102
Specific Uses For Product	Flowering Plant Fertilization
Target Species	roses
UPC	073035040020
Unit Count	10 Count

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