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Plantsmith Fortifying Houseplant Tonic

£15.00 £12.00

Plantsmith Fortifying Houseplant Tonic is a professional-grade houseplant food containing a balance of 13 essential nutrients.

I have been using this product continuously for two years now and have loved the results - my houseplants are altogether perkier and all I have to do is water them.

  • Suitable for all houseplants and succulents
  • 500ml
  • Contains potassium, magnesium and iron for strong, glossy leaves and beautiful, longer-lasting flowers. Kelp extract helps to stimulate cell growth.
  • Reusable glass bottle with plastic spray

As a fledgling business founded on the principles of friendliness, dependability and simplicity, we aim to deal with your order gracefully and efficiently so that you can devote your time to more important things. 

Our aim is to process your order within 24 hours of receipt and we expect it to arrive within 3-5 working days under normal circumstances.

Deliveries cost £3 for small, slim items that will slip into an envelope.

Most other deliveries cost £6 for any number of items, so don’t hold back!

Where age verification is required, a special service costing £10 is what we use to keep us all safe and sound.

Deliveries to far-flung UK locations may incur an additional charge.

Should you need to return an item, drop us a line at within 14 days of receiving your purchase, providing your name, order number and the reason for your return. We will let you know how to return your item.

Please visit our Delivery & Returns page for more information.

Unlike outdoor plants, houseplants are completely reliant on their hosts to keep them well fed. Although they arrive in compost that contains low levels of fertiliser, these nutrients are quickly used up, typically within 6-8 weeks. Using a good plant food will ensure your houseplants are getting the vital minerals and vitamins they need to flourish.

It’s best to feed houseplants regularly during their growing season, which runs from March to September. During this time, use Fortifying Tonic every other time you water your indoor plants. Mixing it couldn’t be easier - simply shake the bottle well and mix 5 ml (approximately 4 pumps) into a litre of tepid water and apply to the compost at the base of the plant. For younger plants mix the same amount into 2 litres of water so that it's slightly weaker.

Ensure your plants do not sit in water as this will rot the roots and kill the plants. Come back and check 15 minutes after watering and pour away any water that remains in the saucer or planter.

Brand Focus


The team at Plantsmith are on a mission to demystify houseplant care and help indoor gardeners get the best from their greenery. Born from over 40 years of horticultural experience, Plantsmith products are professional formulations that combine essential minerals and natural, non-toxic ingredients. These are high-performance products, packaged beautifully in reusable bottles to reflect their quality.  

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