error C2259: number_of_plants: невозможно создать экземпляр абстрактного класса

#include "flower.h"
#include <fstream>
#include <sstream>
#include <string>
#include <algorithm>
#include <iostream>
#include <iterator>
#include <cctype>
FILE*uf;
 
using namespace std;
 
void main()
{
 plants* a_1r;
 number_of_plants a_5;
one_year a_2("Trava","Roslunu");
many_year a_3("Derevo","Roslunu");
 
cout<<"Name:"<<a_2.name<<" One_year:"<<a_2.one_year_plant<<endl;
cout<<"Name:"<<a_3.name<<" One_year:"<<a_3.many_year_plant<<endl;
 
cout<<" Robota polimorfizmy\n";
 
a_1r=&a_2;
a_1r->vuvid_name();
a_1r->func();
 
a_1r=&a_3;
a_1r->vuvid_name();
a_1r->func();
 
 
cout<<"Number_of_plants:"<<a_5.number_plant<<endl;
 
cout<<endl;
 
}

#ifndef flower_h_
#define flower_h_
 
 
#include<iostream>
#include <string>
using namespace std;
 
class plants
{public:
    char*name;
    plants(char*d)
    { int l=strlen(d)+1;
        name=new char[l];
        if(! name)
        {cout<<"Pomulka dostypy\n";
            exit(1);}
        strcpy(name,d);
    }
    plants()
    { char*name1=new char[];
    name1="Romashka";
        if(! name1)
        {cout<<"Pomulka dostypy\n";
            exit(1);}
    }
    
virtual ~plants(){delete []name;}
virtual void vuvid_name(){cout<<"Name "<<name;}
virtual void func()=0;
 
};
 
class one_year:public plants
{public:
char*one_year_plant;
 
one_year(char*d, char*s):plants(s)
        { int l=strlen(d)+1;
        one_year_plant=new char[l];
            if(! one_year_plant)
            {cout<<"Pomulka dostypy\n";
            exit(1);}
        strcpy(one_year_plant,d);}
    
virtual ~one_year(){delete []one_year_plant;}
void vuvid_name(){ cout<<"\nName "<<name;};
void func() {cout<<"\nVukonannia f-ii klasy one_year\n";}
 
};
 
class many_year:public plants
{public:
char*many_year_plant;
many_year(char*d,char*s):plants(s)
        { int l=strlen(d)+1;
        many_year_plant=new char[l];
            if(! many_year_plant)
            {cout<<"Pomulka dostypy\n";
            exit(1);}
        strcpy(many_year_plant,d);}
virtual ~many_year(){delete []many_year_plant;}
void vuvid_name(){ cout<<"\nName "<<name;};
 void func() {cout<<"\nVukonannia f-ii klasy many_year\n";}
 
};
 
class number_of_plants:public plants
{public:
    int number_plant;
    number_of_plants(){number_plant=9;};
};
 
#endif

class plants
{
//...
virtual ~plants(){delete []name;}
virtual void vuvid_name(){cout<<"Name "<<name;}
virtual void func()=0;//Чисто виртуальная функция
//...
};
 
class number_of_plants:public plants //Наследуете абстрактный класс
{public: 
     int number_plant; 
     number_of_plants(){number_plant=9;}; 
//Где реализация func?
};
 
void main()
{
 plants* a_1r;
 number_of_plants a_5; //Пытаетесь создать экземпляр абстрактроно класса
//...
}

virtual void func() {cout<<"\nVukonannia f-ii klasy number_of_plants\n";}

system("pause");
exit(1);

plants()
{
char*name1=new char[10];
strcpy(name1,"Romashka");
 }

class many_year:public plants
{public:
char*many_year_plant;
many_year(char*d,char*s):plants(s)
        { int l=strlen(d)+1;
        many_year_plant=new char[l];
        
        strcpy(many_year_plant,d);}
virtual ~many_year(){delete []many_year_plant;}
void vuvid_name(){ cout<<"\nName "<<name;};
virtual void func() {cout<<"\nVukonannia f-ii klasy many_year\n";}
 
};