What's wrong with my plants

[Uzair Ali]

I've recently bought Cestrum nocturnum from local nursery and transplant it in pot with 40% sand soil, 40% organic compost and 20% coco peat. But I don't know why its leafs are falling continuously.

https://drive.google.com/open?id=1YX3SeC1Ki3ieq7uC9GhsJIbxVcS81m-K
https://drive.google.com/open?id=1DMGwy-j_WtlkAcvXAN51CE_hfyOpSF3p

Same with rose,
https://drive.google.com/open?id=1bnwIUtQqFNzntGJA152crTl5C0YpNfBu

Pumpkin was growing fine in compost and coco-peat but when I transplanted in soil, compost and coco-peat mix its growth slows down and leafs keep dying
https://drive.google.com/open?id=1W7mjcD1Ps7RY8wuNJue6BFHY5Gc7wEKt
https://drive.google.com/open?id=1OmPZJX_txsZKVRCWsiv3EK5LRtSfU_tv

Falsa died completely after transplant but now new leafs are growing but still dying after some time
https://drive.google.com/open?id=1lkcQj6ifN9chaaI0Rhl_5IdA4c2ni7Me

 

[Marck]

Greetings, welcome to the Forums.

Any additional information that could have been gathered from the photographs is unknown as the image links are dead.

Leaf drop can be a symptom of a watering or drainage issue. Sometimes, too little irrigation, but more often too much.

Judge the success of your potting soil blends by how well they balance water retention and drainage.

All the plants listed in the OP would do best in full sun, with regular water and good drainage, including Night-blooming Cestrum (Cestrum nocturnum, Solanaceae), Rose (Rosa sp. or hybrid, Rosaceae), Pumpkin (Cucurbita cv., Cucurbitaceae), and Falsa (Grewia asiatica, Malvaceae), also known as Sherbet-berry.