Is trigger doesnt work on my collider

Unity Engine
1

im dropping bombs from my 2d plane
if i dont have “is trigger” selected on my box 2d collider it actually works the way i want to but the problem is my plane can then hit the bombs in the air.

my ground collider and bomb are on the same player layer

but if is trigger is enabled the bomb just falls through

here is my bomb script

using System.Collections;
using System.Collections.Generic;
using UnityEngine;

public class BombDrop : MonoBehaviour
{
    public Animator anim;
    private bool exploding = false;

    void Update()
    {
        if (exploding)
        {
            anim.SetBool("HitGround", true);
        }
    }

    private void OnCollisionEnter2D(Collision2D collision)
    {
        if (collision.gameObject.tag == "GroundBorder")
        {
            Debug.Log("Collider works");
            exploding = true;
        }
    }
    }
2

also tried this:

private void OnTriggerEnter(Collider other)

didnt work either

so, does the ground need another collider to detect where bombs are landing, can i not just have a bomb have a trigger that detects when its hitting the existing collider?