Erectile dysfunction is also known as Weak erection. It happens when your penis is unable to attain its actual growth. It is very embarrassing especially during the love making, when you are unable to satisfy your partner or reach the orgasm. You may be thinking that whether it is a disease? Actually it is not, a disease, it has been quite common to those men whose age is above forty. It has been noticed that during their love making they are unable to keep their erection hard enough till the end. This generally happens as the flow of blood through the penile vessel decreases. So, to get harder erection, more blood should flow through this vessel. This can be possible naturally, by adding those vegetables to your diet that grows under the ground.