Grow Tips

Is the Grow Jar disposable?2021-05-21T12:36:11+02:00

The Grow Jar is reusable, but if you want to throw it away, you can add it to the residual waste. The Jar is made from 75% natural ingredients and will therefor have less impact on the environment than normal plastics.

Is the Grow Jar dishwasher safe?2021-05-03T13:03:49+02:00

The Jar is safe to place in the dishwasher, but we recommend to wash it by hand. Attention! The lid is not safe to place in the dishwasher. It’s made from natural bamboo wood and will break due to the water and the heat. 

Is the Grow Jar microwave safe?2021-05-03T12:59:40+02:00

No! The Grow Jar and the lid are not safe for the microwave. Materials may transform or brake due to the heat.

I can’t remove the lid of the jar2021-05-03T12:58:30+02:00

Because of the moist the lid may transform a bit. We advise not to push the lid on the jar, but place it loose on top. It’s important that it’s dark during germination, but it doesn’t matter if the lid is not air-tight.

Help! My Grow Cup is leaking2021-05-03T13:06:01+02:00

Oh no.. are you using the Grow Cup for the first time? Then of course this may not happen. Send us a message and we’ll fix it. Have you used the Grow Cup before? Because the cup is made of bio cardboard with a bio coating, it will become weak after 2 to 3 times and will possibly start to leak .. time for a new set!

What happens after harvesting?2021-05-03T13:06:21+02:00

After harvesting, a few new micro-greens sometimes grow, which grew in a second layer under the large cresses. If the cup is completely trimmed, the soil can be disposed with the compost waste, you can wipe the inside of the cup with a wet paper and you can sow new micro-greens with a refill.

When can the lid come off?2021-05-03T13:06:22+02:00

A dark and humid climate is desirable for the germination of the seeds. Therefor it is important to place the lid for the first 2 to 4 days. Every now and then take a peak under the lid, do the seeds have a small stem? Then the lid can be removed, so that the micro-greens can grow into fresh and healthy seasonings.

What material is the Cup made of?2021-05-03T13:06:01+02:00

The cup and lid are sustainable and responsibly produced disposables. They are made of cardboard (Virgin Fiber, BIO coated) and have an FSC certificate.

How long does it take to grow micro-greens?2021-05-03T13:06:22+02:00

That depends a bit on the type of micro-greens (see indication below) and the circumstances. Are the seeds saturated during the germination and do they get enough water and light after the lid came off? Then the cresses are ready to harvest in about 7 days.

  • Garden Cress – 6 days
  • Daikon Cress – 6 days
  • Rucola Cress – 7 days
  • Brocco Cress – 7 days
  • Red Mustard Cress – 8 days
When are the micro-greens ready to harvest?2021-05-03T13:06:22+02:00

The micro-greens are at their best after 7 days! They now protrude about 5 cm above the edge of the cup. Cut them at the height of the edge of the cup, because the stems are just as tasty!

It looks like there is some mold in the cup?2021-05-03T13:06:22+02:00

Do you see some small shite hairs between the seeds during the first few days? Don’t be afraid, this is not mold. These are the first little roots that will go into the ground. After +/- 7 days, the micro-greens are ready to harvest. If you leave the micro-greens grow on for much longer and neglect them, this could result in some mold.

Do the seeds need any water the first days when they are covered?2021-05-03T13:06:22+02:00

No, they don’t. If the coconut tablet with soil is soaked with 175ml of water, this is wet enough for the first 2-3 days. A dark and humid climate is desirable for the germination of the seeds. If the soil feels dry, it is good to spray the seeds 2 or 3 times with a plant spray.


Grown makes growing easy again. However, it will not happen totally automatic. A dark and humid climate is desirable for the germination of the seeds. For this it is important to place the cover for the first 2 to 4 days *. Take a peek under the lid every now and then, do the seeds have a small stem? The lid can then be removed so that the cresses can grow into fresh and healthy seasonings.

* It depends on the type of cress how long the germination lasts and when the cress can be harvested.


Light plays an important role during the growth of your micro-greens. That’s why CressToday offers a special LED growth lighting that can stimulate growth throughout the year. Apart from that, the micro-greens need their night’s rest, just like in nature. Set CressToday so that the lights goes off in the night for a few hours. If you use the Grow Cups you can best place it in a bright spot in the house, close to the window. Direct sunlight is not desirable.


Water also plays an important role. For example, it is important that the substrate/dirt is saturated before you start sowing. A moist soil activates the germination process. In addition, if you use the CressToday, make sure there is always enough water in the water basin. If you want to help your plants a little extra: Use a plant spray with drinking water every now and then. Microgreens are always thirsty!


Temperature can strongly influence the growth of the greens. That is why the right temperature is desired. This is between 18 and 22 degrees, what’s more or less the average living room temperature. That is why CressToday and the Grow Cup have an open design.


At Grown we use substrate. This substrate consists of wood fiber cellulose for the CressToday and coconut fiber for the Grow Cups. Besides that they hava a good capillary effect and therefore absorbs and retains a lot of water, it also ensures a very clean way of growing. In addition, this natural material also provides food for the plants so that they can grow big and strong.


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