Scriptum/Assets/TreeParticleEffect.cs

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

public class TreeParticleEffect : MonoBehaviour
{

    public ParticleSystem collisionParticleSystem;

    private void OnTriggerEnter2D(Collider2D collision)
    {
        if (collision.tag == "AttackHitbox")
        {
            var em = collisionParticleSystem.emission;
            em.enabled = true;
            collisionParticleSystem.Play();
            StartCoroutine(Timer());
        }
    }

    IEnumerator Timer()
    {
        yield return new WaitForSeconds(2.5f);
        var em = collisionParticleSystem.emission;
        em.enabled = false;
    }
}