Slow Release Natural Based Bonsai Fertilizer Pellets

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Superfly Bonsai Slow Release Bonsai Fertilizer Granules

Our fertilizer will give your bonsai an immediate boost and then maintain feeding over the course of 1-2 months (depending on temperature and the amount you water/it rains).   

Our fertilizers are designed to "melt away" a little each time you water the tree.  This is a super easy and reliable way to steadily fertilize bonsai.  No chemicals to worry about or mix and no little plastic balls left behind in your soil, just organics.

We utilize primarily natural organic ingredients from the sea to formulate the perfect fertilizer for different stages in bonsai development.  You also don't need to worrry about damaging the environment with Superfly Bonsai Fertilizers like you do with chemical fertilizers.

The use of organic fertilizer allows your soil to maintain beneficial microorganisms such as beneficial bacteria, actinomycetes, fungi, protozoa and nematodes that help plants thrive.  Because our fertilizers are organic based, they do not interfere with the soil environment and allow it to flourish.  Chemical fertilizers kill off most if not all microorganisms and do not promote a natural environment within the soil.

Natural based fertilizers may grow some mold in the week after application.  This is normal and it will subside in a few days.  Mold also may be a sign of overwatering, lack of proper air flow and/or highly organic soil that is not normally ideal for most bonsai species.

NPK Choices For Different Needs

Push 12-4-5 Fast Growth of Foliage, Trunks & Branches
Maintain 5-7-4 Maintaining developed bonsai & Assist in Ramification

Use during the growing season for the type of tree you are growing.  In the northeast we use this every other month from April - October for conifers and deciduous trees.  For tropical trees we use this fertilizer year round with 4-5 applications yearly.  Place fertilizer under moss to prevent damage to moss under trees.


    Customer Reviews

    Based on 72 reviews
    Joe Vallino (Marshfield, US)
    Good bonsai fertilizer

    While this fertilizer will dissolve under frequent watering, it still works well compared to others I have tried.

    Ricky Barnett (Sarasota, US)
    Works great!

    My only complaint is I live in Florida where it's vary vary hot and my trees 40+ are under shade cloth and watered 4 times a day so they don't dry out. The pellets turn to mush in about a week and I remove them after 2 weeks a little harder pellets are hard to come by tho so until then these are the best out there!

    RONALD FEUSSNER (Freeland, US)

    Slow Release Natural Based Bonsai Fertilizer Pellets

    Bushido Bonsai (East Bridgewater, US)
    Great Bonsai Fertilizer

    Very easy to apply versus other fertilizers that spill on the ground and roll off. Cheaper price than other high rated organic fertilizers and seems to produce similar results. This will be my new bonsai fertilizer.

    Randall Naftal (Pottstown, US)
    Don't roll off!

    These pellets are perfect for staying on my soil. After watering, they swell up and stay that way avoiding rolling off each time I water.


    Ask a Question
    • I’m a beginner in the bonsai world, what’s the difference between the pellets and the granules? You put it on top right? Sorry I’m a noob at this.

      The granular is used on organic soil only as the pieces will fall through substrate based soil.  The granuar is put on with a provided spoon.  The pellets can be used on either types of soil and are usually put on by hand.  That is about it.

    • How does it smell? I have a different brand organic fertilizer and it smells very bad. It's impossible to use on the trees I keep inside.


      Organic fertilizer is made from organic components.  The fertilizer does not begin to work until it begins to break down which is done by fungus, bacteria and other microscipic organisms.  The process of organic material breaking down generally has an unpleasent smell.  This is why most if not all organic fertilizer smells bad.  That being said, I think ours is amoung some of the best smelling organic fertilizers and it generally only smells bad for a week max.  You will need to try it to judge if this is tolorable to you or if chemical will the be way to fertilizer your bonsai.

    • Can this fertilizer be used simultaneously with other fertilizers or should it be used alone

      It can be used alongside of other fertilizers.  I do suggest carefully reading other fertilizer warnings to be sure it does not interact with anything in our fertilizer.  Our fertilizer is natural based, so does not contain chemicals.  We use this in combination with liquid kelp, hb101 and superthrive.  We do not use any chemical fertilizer on our trees.

    • Do I need to worry about the white mold that grows on the pellets?

      Mold growing on the fertilizer in the week or two after it was applied is totally natural.  The mold should grow only white in color.  The fertilizer is organic so it attracts anything that breaks down organic material, including beneficial bacteria and mold. The mold will go away usually within a week as it will break down and digest the part of the fertilizer it was after in the first place.  I notice this is more common in our nursery pots with organic dirt type soil and with high side walls. The excessive moisture from the soil and lack of air from the walls of nursery pots seem to give the mold optimal conditions.  Mold has a tough time living with good air flow and without water so I don't commonly see it on my show trees and other trees that have been moved to a boon style soil mix (akadama, lava, pumice).  Most of our bonsai are moved into our Professional Mix which is a Boon style ALP mix.

      This is common with nearly every good quality organic fertilzer.


    Thank you for your purchase. We hope you are happy with your items! However, if you are not completely satisfied with your purchase for any reason, you may return it to us for a full refund, store credit, or an exchange. Please see below for more information on our return policy.


    All returns* must be postmarked within thirty (30) days of the purchase date. With the exception of returns for broken/damaged items, all returned items must be in new and unused condition, with all original tags and labels attached.

    *Plants + Trees Returns: By purchasing a tree from us, we assume you know how to properly care for the tree. Bonsai and other plants are alive and will die if not properly cared for. We have no control over how trees are cared for once in your possession. Therefore, by purchasing this tree, you acknowledge that we, the seller, provide no warranties expressed or implied after the tree is delivered. This tree is sold "AS IS" and this sale is considered final. No refunds or exchanges will be offered after the tree is purchased. We will only ship healthy trees. We will require a signature on most trees over $100USD. If the box arrives damaged, please take pictures and make note with the shipping company prior to signing. If you sign for the package, the sale is final.


    For the easiest way to process returns purchased through our website, please visit:

    For items purchased through Etsy, please include the item and invoice # and return to:
    Superfly Bonsai
    Attn: RETURNS
    1670 S. Cameron Street
    Harrisburg, PA 17104

    For items purchased through Amazon, Walmart, or eBay, please visit the vendors website. Linked below is information from each vendor to get you started.
    Amazon: click here
    Walmart: click here
    eBay: click here

    Please note, you will be responsible for all return shipping charges.* We strongly recommend that you use a trackable method to mail your return.

    *Certain returns may be eligible for shipping charge reimbursement. We reserve the right to refuse refunds on shipping charges based on reasons for return.


    Once we receive your item, we will inspect the condition of the items and notify you that we have received your return. We will also notify you on the status of your refund after we've inspected the item.

    If your return is approved, we will initiate a refund to your original method of payment. You will receive the credit within a few business days, depending on your card issuer's policies.


    If you have any questions concerning our return policy, please contact us at:

    *Management reserves the right to refuse a refund, exchange or the resale of any item based on the condition of the merchandise.

    Shipping Policy

    Order Processing

    All orders are processed within 2 to 3 business days (excluding weekends and holidays) after receiving your order confirmation email. You will receive another notification when your order has shipped.

    Plants + Trees Shipping: Shipping may be delayed to prevent the tree from sitting in a warehouse over a weekend or holiday. Most trees ship Monday-Wednesday. We do not ship trees to PO, FPO, or APO boxes. We also do not ship trees out of the continental US or to California.

    Domestic Shipping Rates and Estimates

    For calculated shipping rates: All orders (under $99 USD or Wholesale) will be presented with shipping options that are calculated based on the item weight, box size, and distance from our shipping location.  We currently only use Fedex.
    Free Shipping: All RETAIL orders over $99.00 USD ship free within the continental USA. Free shipping will be the lowest cost option from FedEx.

    In-Store Pickup

    You can skip the shipping fees with free local pickup at our warehouse. We are located at:
    1670 S. Cameron Street
    Harrisburg, PA 17104

    We will send you an email when your order is ready along with instructions.
    Our in-store pickup hours are 10AM-4PM Monday-Friday. Please have your order confirmation email with you when you come.

    International Shipping

    At this time*, we do not offer international shipping.
    *Shipping to Canada and Mexico will be available at some point in the near future. Check back for updates to this section.

    How do I Check the Status of my Order?

    When your order has shipped, you will receive an email notification from us which will include a tracking number you can use to check its status. Please allow 48 hours for the tracking information to become available.
    If you haven’t received your order within a reasonable amount of time, please contact us at with your name and order number, and we will look into it for you.

    Shipping to P.O. Boxes

    FedEx: FedEx will only ship to P.O. Boxes with SmartPost, which we do not offer at this time. Click here for more information.

    Refunds, Returns, and Exchanges

    We accept returns that are postmarked within thirty (30) days of the purchase date. With the exception of returns for broken/damaged items, all returned items must be in new and unused condition, with all original tags and labels attached.
    In the event that your order arrives damaged in any way, please email us as soon as possible at with your order number and a photo of the item’s condition. We address these on a case-by-case basis but will try our best to work towards a satisfactory solution.
    If you have any further questions, please don't hesitate to contact us at

    Large Orders

    If you are a placing a larger order (over 30 bags of soil or many pots), it may be cheaper to ship via freight truck. If you are interested in pricing for this, please contact us here.

    Show Pickup & The Superfly Express

    We attend 7-10 shows a year (if not cancelled), mostly on the east coast. Please check our calendar to see if we may be attending a show close to your location, and we can arrange to bring your order for pickup at the show.  No minimum.

    We started the Superfly Express shortly after the Covid-19 pandemic started.  We did this as a way to get products to wholesale customers with no shipping fee.  We basically will deliver your order on one of our trips to your area for free if the order is over $1000 and you are close to our route.  We will also deliver retail customers orders over $1000 if they don't want to utilizer our free shipping for whatever reason.  We currently only travel east of the Mississippi river and have 4 routes.
    1.  New York/New England Area
    2.  Ohio/Michigan/Illinois/Indiana Area
    3.  Western virginia & NC/Tennessee/Alabama/Mississippi/Kentucky
    4.  Maryland/Eastern Virginia & NC/SC/Georgia/Florida

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