Adafruit has a pretty great soil moisture module that is protected by a mesh:

https://www.adafruit.com/product/1298

But it's a little pricey. If you want a cheaper module, but is prone to weathering, these cheaper and more common devices are your best bet:

https://learn.sparkfun.com/tutorials/soil-moisture-sensor-hookup-guide

Thanks Joshua

hi Shivam Sahil,

monitoring temperature or moisture of soil ?

for moisture monitoring you can use VH400 ( https://www.vegetronix.com/Products/VH400/ )

for temperature monitoring you can use THERM200 (https://www.vegetronix.com/Products/THERM200/)

Also see this links :

https://www.banggood.com/Wemos-Higrow-ESP32-WiFi-Bluetooth-Battery-DHT11-Soil-Temperature-And-Humidity-Sensor-Module-p-1196250.html?gmcCountry=US¤cy=USD&createTmp=1&utm_source=googleshopping&utm_medium=cpc_elc&utm_content=frank&utm_campaign=pla-ele-us-pc-0405&gclid=Cj0KCQjw2KHWBRC2ARIsAJD_r3f0GZZBUAnYXMXYBa7uw73JArkXYgjrrXczJt5ERFGj6G-PKXWqb-gaAt7WEALw_wcB&cur_warehouse=CN

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https://www.amazon.com/DFRobot-Gravity-Capacitive-Corrosion-Resistant/dp/B01GHY0N4K/ref=sr_1_8?s=lawn-garden&ie=UTF8&qid=1517410299&sr=1-8&keywords=Moisture+Sensor

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https://www.google.com/shopping/product/7322159725472566167?client=firefox-b-ab&q=moisture+sensor&biw=1920&bih=968&prds=paur:ClkAsKraX5KISG-j1aiDmgdRGBahzR7nQWUCBgO1NCEp-ua0Ai_JWdPMN_CJb4WY8hcD-3a6EUs6B06yQuZPYl9VEIZecXJzDGxP81GE9ahDTjEwrzTSwoLlBIZAFPVH73oVlP0haEQ87XOGIzuq-c1iCAUOw&sa=X&ved=0ahUKEwihvcnY-YLZAhVC0mMKHaLGCvMQ8wIIzwM

If you think this answer help you, please try to recommend it.