Find the best spider plant fertilizers that will boost growth and help your plant produce more spider webs in no time.
Spider plants remain forgiving even when conditions are not perfect. But a targeted feeding routine can noticeably change growth rate and leaf quality. These plants respond best to a mild, balanced fertilizer in the 10-10-10 or 20-20-20 range, as long as you dilute it to half strength to avoid salt build-up. But there are many more options to choose from!
The best spider plant fertilizers
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General rule: Feed your spider plants every 2-3 weeks in the spring and summer, reduce to once a month in the fall, and stop altogether during the winter when growth naturally slows. Unless the frequency specified for a fertilizer recipe is higher or lower!
1. Balanced liquid indoor plant fertilizer
Nothing works like a classic balanced formula (NPK 10-10-10 or 20-20-20). It is a reliable all-purpose spider plant food that supports leaf growth and firm roots.
Since spider plants prefer a lighter diet than many houseplants, diluting this fertilizer to half or quarter strength is key to preventing salt build-up around their delicate roots. Simple, right?
Pro tip: Every 6-8 weeks, flushing the soil with clean water helps prevent brown leaf tips that often occur when salts build up. Changing brands periodically is also helpful because each formula carries a slightly different micronutrient profile.
You can choose a watering can with long spout to make soil washing much easier. See the best buy option here.
2. Worm Castings Tea
If your spider plant needs a nutritional boost without the risk of burning, worms are the gold standard natural fertilizer. A simple tea made by steeping two handfuls of castor beans in water for a day provides an easy, root-safe liquid feed.
Simply give your spider plant about a quarter cup of dry potting mix or half a cup of tea every 3-4 weeks to keep the soil alive. You can also add a thin top layer before traveling to maintain moisture balance while you’re away.
Many growers notice that spiderworts mature better when casting is part of the routine, largely due to improved root strength.
High quality organic casting worms is the best buy for it, and you will definitely see a noticeable difference in soil and root growth.
Seaweed fertilizer acts as a natural growth stimulant for spider plants. The extract is rich in growth hormones such as cytokinins, which will encourage new shoots and stimulate your spider plants to produce more pupae.
It works best in heavily diluted form (about a quarter of the recommended dose) and can be applied to the soil or lightly dabbed on the leaves for faster absorption.
Simply use it every 3 weeks or so during the growing season to support consistent formation of baby spider plants. You can also apply it as a ground rain or foliage mist for extremely fast absorption.
4. Slow release granules
If you prefer a low maintenance fertilizer routine, slow release granules are your best friend. As the name suggests, they release nutrients gradually with each watering, keeping your spider plant well-fed without the guesswork.
You just need to sprinkle the granules on the soil and lightly mix in the top layer, and that’s it. Just 1-2 teaspoons every 3-4 months is perfect as a slow and steady drip of nutrients keeps spider plants growing steadily without sudden nutrient spikes.
Pro tip: Choose a formula with added micronutrientssuch as iron and magnesium, to prevent pale, washed-out leaves.
5. A mixture of compost and perlite
This is not one of the common spider plant fertilizers you will come across. This is because it is one trick to improve soil structure in ways that spider plants thrive.
You see, spider plants grow noticeably fuller when their soil is kept airy and by mixing in a few handfuls of compost and perlite in the potting mix when transplanting it gives them an ideal environment to anchor.
Even for established plants, working 1-2 cups into the top layer of a medium pot every 6 months helps renew compacted soil.
You can get premium perlite and compost from here to create a much healthier potting mix for your spider plants.
6. Alfalfa tea
Alfalfa meal is another surprisingly effective supplement for spider plants because it contains triacontanol (natural growth stimulant). And when a small amount of alfalfa meal is brewed into a mild tea, it provides gentle organic nitrogen and trace elements that support steady pup production without overwhelming the roots.
Use every 4-6 weeks during the growing season. You will notice that plants treated with alfalfa tea develop fuller crowns and recover more quickly from minor stress.
You can buy your own organic alfalfa meal from here. It is suitable for many applications and is a great choice to move forward.
Fermented plant extract, often used in natural Korean cultivation, is a specialized supplement that gives spider plants a mild metabolic lift. Created by the fermentation of green plant materials (such as comfrey or young shoots) with brown sugarwhich extracts minerals, enzymes and beneficial compounds.
When very diluted, mix only a little (0.5 to 1 teaspoon per gallon of water) into Regular watering can help spider plants push fresher, tighter foliage and bounce back faster after pruning or minor stress.
8. Epsom salt solution
Spider plants develop pale or dull foliage when magnesium is low and a mild Epsom salt solution can fix it faster than most fertilizers.
Simply dissolve 1 tablespoon of Epsom salt in 1 gallon (4 liters) of water and apply as a soil drench every 4-8 weeks during the growing season. Avoid overfeeding, as spider plants prefer mild feeding and may develop leaf tip burn if the solution is too strong.
Why it works: Magnesium enhances photosynthesis and pigment formation, and the sulfur content in it helps enzyme activity. Together, they keep your spider plant greener and healthier.
Choose to buy yours garden grade Epsom salt from here that works well for indoor plants and lasts a long time.
9. Fish emulsion
Fish emulsion may not smell nice, but spider plants love what it does for their leaves. This nitrogen rich formula will help your spider plant produce deeper green foliage with faster shoot growth. Since it is organic, it is very gentle on the roots.
You must mix the emulsion in water at a very weak strength (a quarter strength of the listed amount), as spider plants do not need it very concentrated.
Adding it to your watering routine once every 3-4 weeks keeps the chlorophyll production humming, which makes a definite difference to leaf luster.
Here’s a tip: Many plant owners also notice that after a mild submergence episodefish emulsion helps the plant bounce back faster.
10. Bone meal, but sparingly
Bone meal can support spider plants, but only in very small amounts, as spider plants do not like high phosphorus fertilizers. If you give it to the plant every now and then, the phosphorus will strengthen the roots and support healthier growth of the pupa.
Mix just half a teaspoon into the soil when transplanting, or sprinkle a pinch on top once a year. Remember that overuse can cause nutrient imbalances and raise soil pH too much for spider plants’ comfort. Depart our guide for all the details!
Attention: Never use bone meal on tiny or newly rooted spider plant pups. they grow best with light liquid fertilizers.
Here is a great shopping option for one bone meal fertilizer for your plant.
With the right fertilizer, your spider plant will stay healthy, full and endlessly productive. Try one or two of these options and watch your plant respond with greener leaves and lots of new babies.
