Light

Moss rose plants need full sun, at least six to eight hours on most days to look and bloom their best. If you try to grow them in a shady area, they will fail to produce flowers and the flowers they do have likely won't open.

Soil

These plants thrive in sandy and rocky soil and demand excellent drainage. If your garden bed has clay soil, grow your moss rose in containers rather than try to improve the clay soil drainage. Soil that retains too much water can easily cause the plant to die.

Water

Moss rose plants have low moisture needs, though they aren't quite as drought-tolerant as cacti. The plants will tolerate periods of dryness, but flowering is usually better with some (well-drained) soil moisture. Plan to water the plant if you have a long stretch without rainfall—as a general rule of thumb, one deep watering per week during the hot summer weather should suffice.

Fertilizers

Moss roses can tolerate lean soil, so they typically don't need fertilizer. However, feeding the plant with a balanced, slow-release fertilizer at the time of planting can help promote healthy growth and profuse flowering. You can also fertilize twice during the plant's growing season, this time using a blend that's high in phosphorous for more bountiful blooms.

STEP 1: Prepare Soil Mix

Portulaca can survive in any soil if you water responsibly but it is best to prepare a well-draining soil for better results. Use this composition to make your soil mix

Garden Soil: 70%

Sand/Vermiculite : 20%

Vermicompost : 10%

STEP 2: Sow the Seeds

Choose a Pot of at least 9 inches and fill it with the soil mix. Water the pot thoroughly and sprinkle the seeds. Don't cover the seeds as these seeds require light to germinate. Then cover the pot with transparent plastic to maintain moisture and humidity. Seeds generally take 21-30 days to germinate. In-between these days keep your eye on soil moisture.

STEP 3: Transplant the Seedlings

Don't hurry to transplant the seedlings. Let it grow for about 6-7 inches and then transplant it to some other pot if you feel like the earlier pot is full.

STEP 4: Pruning

At the most, moss roses need light pruning, and only if you live in a zone where they can survive year-round. The best time for pruning moss roses is in the early spring before new growth begins to emerge. Remove any growth that looks dead or diseased—you can also thin out a dense plant to improve air circulation, which can reduce the risk of fungal disease. Deadheading the plant's spent blooms is not necessary.