Making flower bombs (seed bomb): here’s how to!

Do you want to cheer up your street or neighborhood and help bees and other insects? Also in places that are difficult to reach? Then make your own flower bombs. Simply follow our step by step instruction. Easy and fun to do.


What is a flower bomb?

A flower or seed bomb, as many people call it, is a round packet of flower seeds, protected by clay and compost. Ideal for places you just can’t reach, for example because the area is fenced. You can put a flower bomb in your jacket pocket and use it when you see a place that could use some Guerrilla Gardening. The only thing you have to do is throw your flower bomb in the right place. In no time at all you will have transformed that barren, grey spot into a sea of flowers.

Read on for the 7 steps of making flower bombs.

Step 1: collect the ingredients


Use for 10 to 20 flower bombs:

  • 4 tablespoons of clay (bentonite for quick throwing, red clay if you want to keep them for a while);
  • 5 tablespoons compost (or potting soil);
  • Flower seeds (large seeds: two teaspoons / small seeds: half a teaspoon);
  • Optional: 2 teaspoons chili powder.

The clay

Bentonite. If you’re going to use the flower bombs quickly, it’s best to use bentonite. You can buy this at (online) shops for potters. In The Netherlands in Garden Centers you can buy packs of 2 kg bentonite clay of the brand DCM. 

Red (or white) clay. This is a smooth type of clay that you can easily process. It’s a bit more difficult to make these seed bombs bloom, because they are a bit firmer. But if you want to keep the bombs longer, this is the clay to use. You can buy this type of clay at an (online) potter’s shop.

Besides dried clay you can also use naturally occurring ‘wet’ clay. This can be found, for example, in fens with clay soil.


You can use ‘ordinary’ compost or another organic material, such as coconut fibre or potting soil (preferably do not buy potting soil for which peat has been cut). Old potting soil left over from a dead plant also works fine. You can even add tea leaves!


Just out of your spice rack. Using chili will keep annoying critters at a distance. It makes the flower bombs do better.


This is what it’s all about, of course. The choice of your seeds determines what your sea of flowers will look like in the future. Choose the seeds that match the place where you want to throw the bomb.

Flower bombs for fallow land
Here you use flowers that germinate quickly and grow well. For example, poppy, cornflower and chamomile.

Flower bombs for happy bees
Preferably choose indigenous species that belong in the area. For example yarrow, clover, deaf nettle, carrot and bellflower.


TIP: don’t feel like buying all the ingredients separately? You can also buy a readymade seedbomb package from us. Also nice as an original gift. Extra advantage: with this ‘Happy Bee’ package you’ll be supporting the battle of the Guerrilla Gardeners.

Step 2: Collect the other things you need


Besides the seeds, clay, compost and possibly chili powder, you also need: 

  • A bowl;
  • A spoon to stir with;
  • Water (little, you don’t need more than 50 ml);
  • An empty egg box.

Step 3: mix! 

Stir all the dry ingredients into the bowl. Then slowly add water drop by drop. Keep stirring until you notice that your mixture sticks together. Do not make it too wet.


Step 4: roll

Time for the real work: turn your mixture into balls with a diameter of about 3 cm. It’s enough to make about 10 seed bombs. You can flatten the flower bomb a little bit (so it becomes a flying saucer). This way it won’t roll about too long when you throw it.

If you have small seeds then make smaller bombs. If you make them about 2 cm, you can make 20 bombs from this mixture.


Step 5: drying & storing

You can keep your seedbombs well protected in the egg box. If, for example, if you want to carry them in your jacket pocket, they should be really dry. Let them dry for at least 3 days in the dark (!).

Every kind of seed needs different conditions to germinate. Some seeds need cold and others need warmth. This is also the case with light and dark. Because you’ll often use a seed mixture, some seeds might even already germinate during the drying of the flower bombs. You can still use them though!

Note: the longer you keep the seed bombs, the older the seeds and the less they’ll germinate when you throw them.


Step 6: throwing flower bombs

And now it’s time to throw your flower bombs: so go to that place in your neighborhood that could use some flowers! Preferably choose a spot with a fair amount of sunshine. Bring water to give the bombs a fresh start. If it doesn’t rain for a long time, it’s wise to water the bombs regularly. 

If you can’t reach the spot to water the flowerbombs, preferably go on a rainy day, so that the seeds immediately get a splash of water over them. That will give them the best chance of getting a good start. Or have fun using a supersoaker!


Step 7: Inspiring other warriors

Share your photos and story with other Guerrilla Gardeners. Let’s inspire each other to conquer that grey city and transform it into a green oasis. You can share through the Guerrilla Gardeners Facebook page, on Instagram with the #bloembom (#flowerbomb), the #bloemexplosie (#flowerexplosion) or by emailing the Guerrilla Gardeners. 

Want to use our propaganda material? No problem!  

Would you like to share this instruction on your blog or somewhere else for your own green operation? Go ahead. But please do mention that the information came from the guerrilla gardeners and link to our site. 


some more tips

Making your own seed bombs is fun and relaxing thing to do. After all, who wouldn’t be happy getting their hands dirty? Some tips for young and old.

Have fun!

Order what you need here


Love easy? Visit our webshop for ready made flower bombs or kits to make your own. Saves time having to gather everything. 

Workshop kit make your own flower bombs
Ready-made flower bombs
Ingredients to make a lot of flower bombs
box with stuff you need to give a workshop 

Have great fun with your sea of flowers! 

Lees hier onze bloembom Blogs