Grow pennywort this way, and you will only see green leaves, never yellow ones; a single section of root can grow into a full pot.

Pennywort (Hydrocotyle vulgaris) has round, fresh-looking leaves, and its name carries good meaning; it is said to bring good luck and wealth. Just find any cup or bottle at home, put a few stems of pennywort in water, and whether you place it on a windowsill or a desk, it looks especially beautiful and full of atmosphere. But when growing pennywort, the leaves can turn yellow. So how can you make pennywort grow lush and green and fill its pot?
Pennywort planting methods and tips
You do not need to buy a pot of pennywort; you only need to take one or several sections of the white roots from a place where it has been grown before, with or without leaves.
Plant them directly into a flower pot, cover with soil, and water every day. Soon small tender leaves will sprout from the soil. The more it grows, the more lush it becomes.
Or divide one pot of pennywort into bottles for water culture; one pot can be grown into many pots.
If you want pennywort leaves not to turn yellow and to grow emerald green, lush and beautiful, you need to pay attention to these small details.
When pennywort has been grown for half a year without any fertilizing, its growth is very rapid, so it needs a lot of nutrients. At this time, if nutrients are insufficient, the pennywort leaves do not have enough fertility supply, so they will grow thinner and turn yellow. So as long as you immediately apply some fertilizer water or fertilizer soil, the leaves will turn green again.
When fertilizing, chemical fertilizer should be used in small amounts; nutrient solution can also be used. If using organic fertilizer, it must be fully fermented and decomposed. Only this kind of fertilizer will not make the leaves turn yellow; it will only make the leaves grow more and more vigorously.
Water in time. Pennywort likes heavy fertilizer, heavy water and full sun, especially in summer. It must not lack water. When you see the soil is a bit dry, water it in time. Only then will the leaves grow emerald green and glossy.
For the pot used to grow pennywort, you can choose one without drainage holes and directly add half soil and half water. This way of growing is also very low-maintenance. And it can grow especially wildly.
Pennywort is not afraid of strong sun. Like lotus leaves, it likes sunlight. If it is always placed indoors in a place with insufficient light, it will grow tall but not plump, and the leaves will not be green enough or good-looking, and may even turn yellow. So just give it more sun.
When you have time, put pennywort in a well-ventilated, sunny, airy windowsill or beside the balcony, and often leave it outdoors. This will make it grow sturdier and more luxuriant. In a few months it can fill a pot.