On the directions it suggests that the spikes are planted in Oct. and Mar.. Did anyone use the spikes other than these 2 months and see good results?

Yes, I usually fertilizer my palms in April and September. I think you don't want to fertilizer in the winter simply because you don't want them actively growing when there is a danger of frost.

when and how many times a year?

They should be used two times per year.

I am in Northern California. What time(s) of year should I be fertilizing my palm trees?

Here in southern Florida we use them during our spring season between beginning of April to early June if it helps

I have a cluster of 3 palm trees, 2 of them are about 8" in diameter and the 3rd is about 10". Does this mean I have to plant 26 spikes around them?

18 to 26 would be your Ideal planting... This way they are truly protected and are getting the the most nutrients...

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Jobe’s Palm Fertilizer Spikes, Easy Plant Care Fertilizer for Palm Trees and Plants, 5 Count

Jobe’s Palm Fertilizer Spikes, Easy Plant Care Fertilizer for Palm Trees and Plants, 5 Count

Product ID: 1180984

Details

Brand
Jobe's
Item Form
Granules
Item Weight
1.5 pounds
Liquid Volume
1 fluid ounces
Specific Uses For Product
Plant Growth

🌴10-5-10 NPK formula

🕒Twice-yearly application

🧱Pre-measured, mess-free spikes

¥7067

Duties & taxes included

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Sold byAmazon JapanDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

🌿 Feed your palms like a pro—effortless growth, zero mess, all glow!

PROVEN GROWTH BOOSTER - Users report up to 2 inches of extra annual growth and greener foliage.
ZERO MESS ZERO WASTE - Pre-measured spikes eliminate runoff, spills, and odors for clean, easy use.
TRUSTED BY GARDEN PROS - Top-ranked fertilizer with 4.5-star reviews and widespread retailer availability.
ROOT FED NUTRIENT POWER - Delivers essential nutrients directly to palm roots for vibrant growth.
EFFORTLESS TWICE YEARLY CARE - Apply only in March and October—no monthly hassle, just lush results.

Jobe’s Palm Fertilizer Spikes offer a scientifically balanced 10-5-10 NPK formula in convenient, pre-measured spikes that feed palm trees directly at the roots. Designed for twice-yearly application, these spikes prevent nutrient runoff and mess, promoting lush, vibrant foliage and measurable growth with minimal effort. Highly rated and trusted by gardeners, they transform palm care into a simple, effective ritual.

Specifications

ASIN	B000F6XGYG
Best Sellers Rank	#1,890 in Patio, Lawn & Garden ( See Top 100 in Patio, Lawn & Garden ) #62 in Garden Fertilizers
Brand Name	Jobe's Organics
Coverage	Medium
Customer Reviews	4.5 4.5 out of 5 stars (2,044)
Global Trade Identification Number	00716080044437
Included Components	5
Item Form	Granules
Item Type Name	Palm Tree
Item Weight	1.5 pounds
Liquid Volume	1 fluid ounces
Manufacturer	Jobe's
Mixing Ratio	10-5-10
Model Number	01010
Number of Items	1
Number of Packs	1
Part Number	1010
Specific Uses For Product	Plant Growth, Root Development, Seed Development, Soil Conditioning
Target Species	Palm Tree
UPC	078433244971 716080044437 073035010108 078433225451
Unit Count	16 Ounce

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