One of the best ways to ensure decandled pines produce strong summer growth is to feed heavily in spring. Although people living in cooler climates are just wrapping up repotting season, others have been feeding their pines for several months. If you haven’t started feeding yet – and you live in the northern hemisphere – now’s the time to start.
I use both wet and dry fertilizers. Today I applied cottonseed meal, both loose and in tea bags, and fish emulsion. I would have used tea bags for all of my trees but I can save time by applying dry fertilizer loose on my less developed trees.
Cottonseed meal
When applying loose fertilizer to the surface of the soil, I create small mounds with a small scoop.
Applying cottonseed meal to the surface of the soil
After about a week, the fertilizer turns a darker color.
New fertilizer on the left, old fertilizer on the right
A mix of new and old fertilizer
Filling tea bags with fertilizer makes applying and removing fertilizer easy. It also makes it easy to determine how much food a tree is receiving at any given time.
Cottonseed meal in tea bags – this tree needs a few more bags
Tea bags on a healthy pine – I’ll add even more bags next week
I supplement dry fertilizer with liquid fertilizer, most often fish emulsion. I aim for applying it once per week during the growing season.
Applying fish emulsion
Feeding pines heavily in spring helps them recover from the stress of decandling. If trees are weak or underfed at decandling time, I skip decandling for the year to avoid weakening the tree.
For those interested in learning about decandling first hand, I’m holding a class on the topic June 11th at the Bonsai Garden at Lake Merritt in Oakland, CA. Bring your own trees or work on trees provided for your practice. See the course description for details.
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paul3636 says
Do you fertilize single flush and double flush pines
the same???????????
carterbeall says
Regarding fertilization following candle cutting, I understand it is standard to remove all fertilizer, however I have a tree that is not particularly strong because it has been in compacted soil, but was repotted this spring. I have fertilized well and gotten dozens of new candles and back buds, so it seems like I could prune at least the strongest ones in a month or so to balance the energy. Since I am not concerned with needle length at this stage could I continue to fertilize? This is a mature tree in a bonsai pot that has just gotten a bit leggy and weak before it came into my possession.
Mac McAtee says
What a shame that you are only 3000 miles from here Jonas.
Jonas Dupuich says
Hi Paul – good question. The simple answer is no. In short, we feed to support a flush of growth and therefore need to feed trees we decandle more than trees we don’t.
@ carterbeall – good question. It’s hard to say without seeing the tree, though it sounds like it’s pretty healthy. If you’d like, feel free to post the question with a pic or two of the tree at http://ask.bonsaitonight.com
Laurel Raftery says
Where do you get your tea bags for the fertilizer?
Jonas Dupuich says
I don’t have a good source for them, would love to hear if someone has suggestions.
kayamooney says
I’ve found Chinese markets usually Cary pretty strong empty tea bags if you can’t find them there Amazon is bound to carry them.
Mac McAtee says
I buy bulk teabags on Amazon.
africanbirding says
Reblogged this on Wolf's Birding and Bonsai Blog.