So you’re ready to start your first ever Window Sill Herb Garden. Great! Before you do, here’s 5 thing to keep in mind then choosing a bottle:


1) Size

While your new indoor garden can be set up in most bottle sizes, it’s going to work best in a 750ml bottle – such as a wine bottle. Why? The special smart soil that comes with your kit has been enriched with plant nutrients (plant food) that have been customized for a 750ml reservoir (bottle) size.

How It Works Diagram

While a smaller bottle such as a 12oz beer bottle will work ok, it means that the plant nutrients are going to be ~2x stronger than they need to be, plus it also means that down the road you’re going to be refilling your reservoir (bottle) ~2x more often. We wanted to make this easy for you, hence we designed the product to work with a bigger bottle.

2) Color

We recommend using a dark green or brown bottle to set up your garden. Do not use a clear bottle. The reason for this is that green in particular does a good job of blocking the red and blue frequencies of light. Why does this matter? Red and blue frequencies are what plants (and algae) rely on for photosynthesis. Basically if you want clean water you need to block red/blue light from getting in. If you use a clear bottle we can pretty much guarantee that you will end up with algae in your water. As well as not looking very nice, this algae is also going to consume nutrients that would otherwise be available for your plant.

“But I really really want to use this fancy clear bottle because I love the shape!” That’s great! Why not consider making a craft project out of it by painting the bottle and decorating it? Not only will this look cool, but the decoration will also help block the light! (pro tip: apply a strip of tape along one side before you start. When done, remove the tape to leave yourself a clear strip so you can still check the water level)

Here’s some inspiration we’ve collected for you on Pinterest.

3) Material

The size and color requirements above lead most people to using red wine bottles – which we’ve generally found work well. For some people glass is a bit of a concern, particularly if you have pets or children.

We like using glass bottles because there’s less concern about nasties leaching into the water and hence our food, as is the case with some plastics. Plastic bottles will work fine – as long as points #1 and #2 above are met. Just make sure you check the material (there’s many different types of plastics) and make sure it’s safe.

In case you were wondering about our product itself: that’s made from a material called PLA which is a corn starch based plastic. This material is FDA approved, food safe and biodegradable. It costs us a bit extra to use a biodegradable material like this, but we feel it’s money well spent.

4) Contents

Former beverage bottles are best because they are least likely to leave residue in the bottle. Whilst they can look really cool, one of the things we’ve discovered in testing olive oil bottles is that they are really hard to get clean – and the oil residue in the bottle can cause a fungus on the plants roots.

If you’re going to use a bottle that formerly contained a food substance, we recommend first washing out the bottle with warm soapy water, then washing again with a small amount of household bleach, before a final rinse with fresh water. This will get the bottle as clean as possible.

5) Shape

Pretty much any bottle shape will work. We designed our Window Sill Garden inserts to be long enough that they can wick (using a capillary action) water up from the reservoir (bottle) for at least a couple of weeks while the seeds are getting started.

A dark green colored former red wine bottle is perfect in pretty much every way – and if you have one, use it. The only minor adjustment we’d make to the bottle (if we could) would be to use something with a slightly shorter neck – like the kombucha bottles pictured below (thanks @thefrenchkoala and @jaydenkahl for the pic!)


6) “Eek! I used the wrong bottle!”

No problems! It’s easy to switch bottles. Just prepare the new bottle, carefully remove the insert, transfer the water to your new bottle (this bit is super important – don’t use new water as it will be missing the nutrients), then pop the insert into the new bottle.

So there you go! Hopefully, these tips help you set up your new indoor herb garden by making sure you have the right bottle. Have fun with it – and we’d love to see the creative things you’re able to do with an item which would have otherwise been thrown away. Make sure to tag us on social media (@GetUrbanLeaf) when showing off your handy work!

If you’ve got your bottles sorted, we recommend you check out this lighting blog next! If you’d like to receive more tips about setting up your garden please sign up below, or drop us an email at [email protected]



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