What is nutrient composition? Nitrogen, potassium, etc?

Nitrogen, phosphate, potash, 16-4-4

I have a small Japanese Maple and 10 young tea olives that I want to use the spikes to fertilize. How many per tree would be enough trough spring and

It depends on the diameter (i.e., trunk width at 1 ft from grade) of the trees. If 1-2 inches, then plan on 2 spikes per tree. Above 2 inches, its basically 1 spike per inch diameter.

We have a 25 year old (40ft) maple tree in tx that doesnt look healthy. Will this product work? How should we use it? Thank you

Your maple needs iron like someone else posted. So no, this product is not enough because you need the IRON! Try this product from Jobes: Ross® Green Again Iron Formula Root Feeder Refills Make sure your trees are healthy and green all season long with Ross® Root Feeder Refills Green Again® with Iron. Chlorosis, a yellowing of the leaves with green veins, is caused by a lack of iron in your plant’s diet. Use refills in your Ross® Root Feeder to get the perfect balance of nutrients directly to plants’ roots - while watering. These refills are a special formula of fertilizer plus iron for plants suffering from yellow-leaf iron deficiency. Apply when first symptoms appear or to prevent deficiency if chlorosis has been a problem previously. Ross® pre-measured refills make for fast, easy and mess-free fertilizing.

is this Spike for Dogwood Trees?

I do not know about dogwood trees. I have used this spike on my Hickory tree, Ash tree, Maple tree and Spruce tree. They have all done well. Grew larger with many leaves. I am not a 'gardener' but person who uses fertilizer on my lawn, shrubs, flowers and trees. Dogwood is a deciduous tree and I would think that these spikes would not harm it -- as I have used it with my deciduous trees.

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🌿 Feed your roots, flaunt your greens — effortlessly!

ROOT ZONE TARGETING - Direct soil insertion ensures nutrients reach roots efficiently for maximum uptake.
SEASON LONG FEEDING - Slow-release spikes deliver continuous nourishment all season without reapplication.
VERSATILE PACK SIZE - Convenient 3-pack with 5 spikes each, perfect for multiple shrubs or trees.
EFFORTLESS APPLICATION - Premeasured spikes insert directly into soil—no mixing, measuring, or mess required.
BALANCED NUTRIENT BOOST - Optimized 16-4-4 formula fuels lush, healthy shrubs and trees.

Jobe Tree Fertilizer Spikes provide a professional-grade 16-4-4 nutrient formula in easy-to-use, slow-release spikes that feed shrubs and trees all season long. Designed for direct soil insertion, these premeasured spikes eliminate mixing and mess, delivering continuous nourishment right to the root zone. Available in convenient 3-packs, they’re perfect for busy gardeners seeking efficient, effective plant care.

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Size	3Packs (5-Spikes Per Package)
Manufacturer	Jobe's
Item Weight	12 Ounces
Assembly Required	No
Product Dimensions	16.51 x 24.13 x 6.35 cm; 340.19 g
Package Weight	1.84 Kilograms
Batteries Required	No
Batteries Included	No

Jobe Tree Fertilizer Spikes, 16-4-4 Hour Release Fertilizer All Shrubs & Trees 3 Packs (5-Spikes Per Package)

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