Sustee troubleshooting

Having trouble with your Sustee moisture meter? Most issues are easy to fix. Here are the most common problems and what to do.

My Sustee stays white after watering

If your Sustee doesn't turn blue after watering, try these checks:

• Using a new Sustee? Water your plant thoroughly until water runs from the drainage holes. This activates the sensing core.
• Prime the Sustee: Place it in a cup of water and wait for the indicator to turn blue before inserting it into your already-watered plant.
• Check the potting mix: Compacted, muddy or root-bound soil can block the water inlet. Loosen the mix slightly or try a different position.
• Water drains quickly? In very coarse potting mix, water can drain before reaching the Sustee. Try directing some water around the base of the Sustee.
• Recently replaced the refill? Make sure the small straw remains attached to the refill — it is essential for the Sustee to work correctly.
• Used for 6–12 months? The refill may have reached the end of its working life and need replacing.

Some potting mixes take longer to absorb water, so allow up to an hour for the indicator to change.

My Sustee stays blue for ages

This usually means your potting mix is still holding enough moisture — which is a good thing!

Check that you're not watering too frequently and that your pot has adequate drainage. Sustee will also stay blue for longer during cooler weather when plants generally use less water.

If it never turns white, the refill may need replacing.

My Sustee isn't changing colour at all

If Sustee has stopped responding, the sensing core may have reached the end of its life.

Replace the refill, then prime the new refill in water until it turns blue before inserting it into the pot. Sustee refills generally last around 6–9 months, depending on conditions and use.

Can I move my Sustee between plants?

Yes, but Sustee needs to dry completely before moving it to another plant.

1. Remove Sustee and rinse off any potting mix.
2. Allow it to dry completely.
3. Insert it into the new pot and begin monitoring again.

Alternatively: Do you have similar plants in a similar position - ie: 2 same sized Pothos on the same shelf? Try using Sustee as a guide for both plants.

Still unsure?

Remember the simple rule:

⚪ White = Water
🔵 Blue = No need to water
🔵 Any hint of blue? Wait it out.

Sustee is designed to help you water according to your plant's actual moisture needs — not according to a calendar.

Drop us a line at hello@plantsinabox.com.au if you're having more trouble.....we love to help!