54-companion-plants

public Boolean companionPlants(String plant1, String plant2) {
    //create list and then sort so order doesn't matter
    List<String> plants = new list<string>();
    plants.add(plant1);
    plants.add(plant2);
    plants.sort();

    if (plants[0] == 'cucumbers' && plants[1] == 'lettuce'){
        return true;
    }
    else if (plants[0] == 'lettuce' && plants[1] == 'onions'){
        return true;
    }
    else if (plants[0] == 'carrots' && plants[1] == 'onions'){
        return true;
    }
    else if (plants[0] == 'onions' && plants[1] == 'tomatoes'){
        return true;
    }
    else{
        return false;
    }

}