How To Make An Organic Houseplant Fertilizer

We don’t refer to houseplants as ‘plant babies’ for no reason! Showering our indoor flowers and greenery with a little tender loving care is not to be neglected, especially during the summer. Keep your houseplants happy with the easy recipe for indoor plant fertilizer, courtesy of Stephanie Rose’s book, Garden Alchemy: 80 Recipes and Concoctions for Organic Fertilizers, Plant Elixers, Potting Mixes, Pest Deterrents, and More.

DIY Plant fertilizer

Feeding With Fertilizer

Houseplants tend to do quite well if they live in a warm place with enough light. But being trapped in a pot means they don’t have an endless supply of nutrients to drink up.

DIY Plant fertilizer

As a plant parent, you have to make sure that your baby has enough to eat. Regular fertilizing will keep your houseplants healthy, beautiful, and growing!

When To Feed

Avoid fertilizing houseplants in the winter. Most varieties aren’t in an active stage of growth in the colder months, and feeding them can lead to a weak and leggy plant, yellow burn marks on the leaves, or worse.

DIY Plant fertilizer

Fertilize houseplants monthly in the spring and summer. Discontinue in the fall and winter.

Indoor Plant Fertilizer


  • 1 tablespoon soluble seaweed
  • 1 tablespoon alfalfa meal
  • 1 tablespoon blood meal
  • 1 tablespoon soft rock phosphate
  • 1-gallon rainwater or dechlorinated water

DIY Plant fertilizer

How To Make It

  • Measure the above ingredients and add them to a glass jar or a container with a lid. Stir well and shake before using.
  • Take ½ cup of the fertilizer blend and dilute in 4 cups of water.
  • Use the diluted mixture immediately. Store the undiluted fertilizer blend in a cool, dark place for up to three months. If it begins to smell bad, becomes discolored, or forms mold, discard and make a new batch.
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Catherine Sherriffs

Editor at Garden Culture Magazine

Catherine is a Canadian award-winning journalist who worked as a reporter and news anchor in Montreal’s radio and television scene for 10 years. A graduate of Concordia University, she left the hustle and bustle of the business after starting a family. Now, she’s the editor and a writer for Garden Culture Magazine while also enjoying being a mom to her three young kids. Her interests include great food, gardening, fitness, animals, and anything outdoors.